Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
The probability distribution of the number of accidents in Grand Rapids, Michigan, each day is given by x 0 1 2 3 4 5 P(x) .20 .15 .25 .15 .20 .05 This distribution is an example of:
Wednesday, October 10, 2012 at 12:42am

Statistics
Given that x is a normally distributed random variable with a mean of 28 and a standard deviation of 7, find the following probability: P(x<28) I understand that the means is 28 and the standard deviation is 7. However what I don't understand is how to get the value of ...
Tuesday, October 9, 2012 at 11:48am

Math,statistics
The sum of 16 reciprocals (1 over the number) is found to equal 4. What is the harmonic mean of the original (i.e., non-reciprocated) scores?
Tuesday, October 9, 2012 at 12:09am

Math,statistics
The sum of 16 reciprocals (1 over the number) is found to equal 4. What is the harmonic mean of the original (i.e., non-reciprocated) scores?
Tuesday, October 9, 2012 at 12:00am

Statistics
if it can be assumed that 39.5% of all telephone #'s are unlisted, and that all telephone #'s are independent,find the probability that at least 1 of 5 telephone numbers are listed.
Monday, October 8, 2012 at 10:58pm

Statistics
When a truckload of apples arrives at a packing plant, a random sample of 250 is selected and examined for bruises, and other defects. The whole truckload will be rejected if more than 5% of the sample is unsatisfactory. Although it is not known, in fact 8% of the apples on ...
Monday, October 8, 2012 at 4:36pm

calculating & reporting healthcare statistics
an employee currently earning $10.85 per hour has been awarded a 3.5 percent merit raise. What will the employee's hourly salary be with this increase?
Sunday, October 7, 2012 at 9:53pm

Statistics
What is the probability that we would obtain two sample means that differ by 1.875, when the SD of the sampling distribution is estimated at .125 when our sample has 8 subjects?
Sunday, October 7, 2012 at 8:36pm

statistics
1)Let X have a normal distribution with mean 6 and standard deviation 3. a) What is the probability that X > 8.7 2)What is the probability that X<0? 3)What is the probability that |X-6| > 1.9 ? I have got so far: P(Z > 0.9) but I do not know where to go from here! ...
Sunday, October 7, 2012 at 2:22pm

statistics
. In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild side effect (B) at least six will have this ...
Sunday, October 7, 2012 at 9:46am

Statistics
. In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild side effect (B) at least six will have this ...
Sunday, October 7, 2012 at 9:46am

statistics
1. The exam scores for the students in an introductory statistics class are as follows. 88 63 90 64 82 98 96 75 89 86 76 84 70 67 34 89 85 39 81 96 92 85 a. Compute the mean and the median score. b. Identify the shape of the distribution of score. Explain why. c. Construct a ...
Saturday, October 6, 2012 at 11:52pm

Math Statistics
I am stuck can someone help me 19.2 - 21.1 ---------- 3.18 \/25
Saturday, October 6, 2012 at 8:39pm

statistics
How do you calculate the degrees of freedom for unequal sample sizes and unequal variance (independent t test)
Saturday, October 6, 2012 at 8:39pm

Statistics 2231
12.05 A study of the students taking distance learning courses at a university finds that they are mostly older students not living in the university town. Choose a distance learning student at random. Let A be the event that the student is 25 years old or older and B the ...
Saturday, October 6, 2012 at 6:22pm

statistics
How is the standard error of the mean influenced by sample size and standard deviation?
Saturday, October 6, 2012 at 3:12pm

statistics
A school adjustment inventory is administered to boys and girls of primary school.Find out weather two groups differ significantly from each other Number mean Std deviation Boys 100 32 10 girls 100 30 6
Friday, October 5, 2012 at 9:40pm

statistics
According to the book Are you Normal?,40% of all US adults try to pad their auto insurance claims to cover their deductible. Your office has just received 128 in insurance claims to be processed in the next few days, what is the probability that fewer than 45 of the claims ...
Friday, October 5, 2012 at 4:06pm

Statistics
In a recent study a SRS of 525 employed Americans, 53 individuals indicated that they would fire their boss if they could. Calculate a 90% confidence interval for the population proportion who would fire their boss if they could.
Thursday, October 4, 2012 at 11:39pm

statistics
You are given the following data. Number of Absences Final Grade 0 95 1 91 2 82 3 69 4 67 5 58 - Find the correlation coefficient for the data. - Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Thursday, October 4, 2012 at 11:05am

statistics
Two cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of Jacks drawn in a set of 2 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed ...
Thursday, October 4, 2012 at 11:04am

statistics
Determine whether each of the distributions given below represents a probability distribution. Justify your answer. (A) x 1 2 3 4 P(x) 1/5 5/12 1/3 1/6 (B) x 3 6 8 P(x) 0.2 2/5 0.3 (C) x 20 35 40 50 P(x) 0.3 -0.1 0.5 0.3
Thursday, October 4, 2012 at 11:03am

statistics
. For the table that follows, answer the following questions: x y 1 -1 2 -5 3 -9 4 - Would the correlation between x and y in the table above be positive or negative? - Find the missing value of y in the table. The missing value of y = How would the values of this table be ...
Thursday, October 4, 2012 at 11:03am

statistics
If the correlation coefficient is -0.54, what is the sign of the slope of the regression line? - As the correlation coefficient decreases from 0.86 to 0.81, do the points of the scatter plot move toward the regression line, or away from it
Thursday, October 4, 2012 at 11:01am

statistics
Speeds for a randomly selected sample of n = 36 vehicles will be recorded. Determine the values that fill in the blanks in the following sentence. For samples of n = 36 vehicles, there is about a 95% chance that the mean vehicle speed will be between ___ and ___.
Wednesday, October 3, 2012 at 9:42pm

statistics
Use your data to make a frequency table by age, with 7 classes, starting at age 10 with a class width of 10.
Wednesday, October 3, 2012 at 2:48pm

statistics
For each of the following samples that were given an experimental treatment, test whether they represent populations that score significantly higher than the general population: (a) a smaple of 100 with a mean of 82, (b) a sample of 10 with a mean of 84. The general population...
Tuesday, October 2, 2012 at 8:40pm

statistics
Suppose it is known that the average score of all high school seniors taking a national test of basic skills is 420. These scores are normally distributed with a standard deviation of 80. A school gives the test to a sample of 144 seniors. Identify the following ...
Tuesday, October 2, 2012 at 7:31pm

Statistics - math
Each consumer has a 25% chance of preferring your product over the competitor's product. If we question 15 customers, what is the probability that at least 3 will prefer your product?
Tuesday, October 2, 2012 at 5:33pm

Statistics - math
An urn contains 5 red balls and 10 white balls. 6 balls are randomly drawn and not replaced. What is the probability that 3 or fewer balls drawn are red?
Tuesday, October 2, 2012 at 5:25pm

Math/Statistics
Can anyone please help me explain confidence intervals. How does one tell/determine if a confidence interval is too wide? What indicates too wide? Thanks in advance!
Tuesday, October 2, 2012 at 10:07am

statistics
supposed that the average weight loss for someone on a diet is 15 pounds with the standard deviation of 4 pounds. a sample of 18 adults enrolled a sswp have a mean weight loss of 15.83. using 0.01 level of significance.
Tuesday, October 2, 2012 at 7:31am

statistics
a manufacturer of bicycle tire has developed a new system which he claims an average life span of 5 years. with the standard deviation of 1.2 years a dealer product claims that the average life span of 150 samples is only 3.5 years. test the difference of population and sample...
Tuesday, October 2, 2012 at 7:28am

statistics
4. A college student is interested in whether there is a difference between male and female students in the amount of time spent studying each week. The student gathers information from a random sample of male and female students on campus. Amount of time spent studying is ...
Monday, October 1, 2012 at 11:52pm

Statistics
3. A researcher is interested in comparing the Christian maturity level of students who volunteer for community service versus those who do not. The researcher assumes that those who perform community service will have higher Christian maturity scores. The maturity scores tend...
Monday, October 1, 2012 at 7:17pm

Statistics
Let X1,...,Xn be a sample from the N(0, sigma^2). 1) Find the method of moment estimator of sigma^2 2) Find the MLE estimator of sigma^2
Monday, October 1, 2012 at 1:54pm

Statistics
. Payne (2001) gave participants a computerized task in which they first see a face and then a picture of either a gun or a tool. The task was to press one button if it was a tool and a different one if it was a gun. Unknown to the participants while they were doing the study...
Monday, October 1, 2012 at 11:22am

Statistics
(1.96)(19.08) divided by square root 52
Sunday, September 30, 2012 at 10:23pm

statistics
for a sample of 3 to have a mean of 115 would this be unusual
Sunday, September 30, 2012 at 7:22pm

STATISTICS
The height of PU men are normally distributed with mean 65 in. and standard deviation 5.3 in. find the probability of finding: a. A men selected is at least 75 in. tall? b. A man selected is no less than 58 in. tall?
Sunday, September 30, 2012 at 6:27pm

statistics
State the null and alternative hypothesis for the following: 1.) A small local bank wants to check if the average daily balance is not higer than 3500 for its individual saving account. Ho: Ha: 2.) A researcher wants to find out if the mean weekly wage of several thousands of ...
Sunday, September 30, 2012 at 11:09am

Statistics
he life expectancy of a lung cancer patient treated with a new drug is normally distributed with a mean of 4 years and a standard deviation of 10 months
Sunday, September 30, 2012 at 9:03am

Math Statistics
In general, what is the relationship between the standard deviation and variance? a. Standard deviation equals the squared variance. b. Variance is the square root of standard deviation. c. Standard deviation is the square root of variance. d. These two measures are unrelated.
Saturday, September 29, 2012 at 6:41pm

Math Statistics
A sample has a mean of M = 25. If one person with a score of X = 25 is added to the sample, what effect will it have on the sample mean? Why and how is there no effect on the sample mean? I am not really understanding this?
Saturday, September 29, 2012 at 2:20pm

Math Statistics
A sample has a mean of M = 25. If one person with a score of X = 25 is added to the sample, what effect will it have on the sample mean?
Saturday, September 29, 2012 at 2:01pm

statistics
SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 97.5? Show all work as to how ...
Saturday, September 29, 2012 at 10:03am

statistics
Suppose we have a set of body temperatures with a mean of 98.6 degrees, and a sample standard deviation of 1.0 degree. Assuming a normal distribution of body temperatures in the larger population, between what two values should 95% of all temperatures lie? Show all work
Saturday, September 29, 2012 at 10:02am

statistics
A sample of purchases at the local convenience store has resulted in the following sample data, where x = the number of items purchased per customer and f = the number of customers. x= 1,2,3,4,5 f=8, 20, 8, 8, 7 What does the 20 stand for in the above table? Find the midrange ...
Saturday, September 29, 2012 at 10:02am

statistics
In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Ability to concentrate; ...
Saturday, September 29, 2012 at 10:00am

statistics
A student scored 30 percent on a test, and was in the 24th percentile. Explain these two numbers! Please show work!
Saturday, September 29, 2012 at 9:59am

statistics
. In terms of the mean and standard deviation: - What does it mean to say that a particular value of x has a standard score of +1.5? - What does it mean to say that a particular value of x has a z-score of -2.6?
Saturday, September 29, 2012 at 9:59am

statistics
For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 72 Standard deviation = 9 Range = 52 Mean = 72 Median = 68 Mode = 70 Midrange = 57 Answer each of the following: I. What score was earned by ...
Saturday, September 29, 2012 at 8:35am

statistics
The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected What is the probability that the average of this sample will be within 1.4 STANDARD ERRORS of the population mean?
Friday, September 28, 2012 at 4:07pm

statistics/calculus
e^(10)-e^(10-x)-x/(e^(10)-11)=0.25 and e^(10)-e^(10-x)-x/(e^(10)-11)=0.75 -Solve both for x. -Can you solve both of these for x without a Ti-89 calculator? If so how? -The reason I want to calculate this is to find upper and lower quartiles of a deformity angle which is ...
Thursday, September 27, 2012 at 10:18pm

statistics
Calculate the variance version of standard error for each sample in Exercise 10.18—for the liberals (2, 1, 3, 2) and then for the conservatives (4, 3, 3, 5, 2, 4).
Wednesday, September 26, 2012 at 8:51pm

statistics
An insurance firms wants to examine the relationship between text messages per day and insurance claims. The following data is a sample of 5 participants: Cellphone Texts per day (X) Insuance Claims ($$) (Y) 4 800 18 2600 12 2800 26 0 20 6000 Choose the correct Estimated ...
Wednesday, September 26, 2012 at 8:01pm

statistics
Thomas needs a b in his class. his current test scores are 88, 83, 86 and 72. his final exam is worth 3 test scores. In order to ear a b Thomas average must lie between 80 and 89 inclusive. what range of scores can Thomas receive on the final to earn a b in the class?
Wednesday, September 26, 2012 at 3:54am

statistics
an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?
Tuesday, September 25, 2012 at 9:53pm

statistics
A soft drink distributor was interested in examining the relationship between the number of ads (x) for his product during prime time on a local television station and the number of sales per week (y) in 1000’s of cases. He compiled the figures for 20 weeks and computed ...
Tuesday, September 25, 2012 at 9:01am

Statistics
The probability that a parent will visit a restaurant after kids game is know to be .68 and assumed the same for all parents. Assuming customer visits are independent and identical, determine the probability that 5 of 7 parents selected at random visit the restaurant. ...
Tuesday, September 25, 2012 at 12:51am

maths(statistics)
it is about the system R or R programme. Can anyone help me about the question? Urgent! Let X denote the concentration of calcium carbonate (CaCO3) in milligrams per liter. Following are 20 observations of X: 130.8 129.9 131.5 131.2 129.5 132.7 131.5 127.8 133.7 132.2 134.8 ...
Monday, September 24, 2012 at 11:07pm

Business Statistics
12 out 20 finished the PGA tour - representatives of the probability that a randomly selected PGA tour payer uses Titlist brand golf balls . For a sample of 15 PGA Tour players c. For sample of 15 PGA players compute the EXPECTED number of players who use Titlist d. For sample...
Monday, September 24, 2012 at 8:40pm

Statistics
Suppose that P(A) = 0.69 P(B) = 0.57 P(AB) = 0.35. Find the conditional probability that B occurs given that A occurs. Round your answer to 3 decimal places.
Monday, September 24, 2012 at 7:41pm

statistics
An insurance company charges its policy holders an annual premium of $200 for the following type of injury insurance policy. If the policy holder suffers a "major injury" resulting in lengthy hospitalization, the company will pay out $15,000 to the injured policy ...
Monday, September 24, 2012 at 2:38pm

statistics
In a distribution with m = 40 and s = 2, a score of X = 46 would be considered an extremely high score.
Sunday, September 23, 2012 at 7:32pm

Psychological Statistics
Assume that GRE scores approximate a normal curve and have mean of 500 points and a standard deviation of 100. What proportion of the normal curve would correspond to each of the following situations? 1) A score more than 50 points above the mean? 2) A score more than 100 ...
Saturday, September 22, 2012 at 8:18pm

statistics
Five samples are taken every hour from a production line & the average hourly measurement weight of polymer beads is recorded. Approximately 1/7 of these averages exceed 2.50g when the mean value is approximately 2.40g. Determine the proportion of individual readings exceeding...
Saturday, September 22, 2012 at 2:42pm

statistics
Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and ...
Saturday, September 22, 2012 at 1:57pm

Statistics
On the daily run of an express bus, the average number of passengers is 48. The standard deviation is 3. Assume the variable is normally distributed. Find the probability that the bus will have Between 36 and 40 passengers
Saturday, September 22, 2012 at 12:58pm

Statistics
The retail price of 12-pack soda can be characterized as having a normal distribution with a mean of 3 dollars and a standard deviation of .25. Below what price do you find 30 % of all 12 packs?
Saturday, September 22, 2012 at 10:02am

statistics
The director of an alumni association for a university wants to look at the relationship between the number of years since graduation and the amount of monetary contribution an alumnus makes to the university. He collects data on 50 alumni who have made contributions this year...
Saturday, September 22, 2012 at 1:23am

statistics
In a large class, there were 220 students who wrote both the midterm and the final exam. The standard deviation of the midterm grades was 14, and that of the final exam was 20. The correlation between the grades on the midterm and the final was 0.60. Based on the least squares...
Saturday, September 22, 2012 at 1:20am

statistics
suppose 45 students in an organization are male and 55 are female. Ten females and 15 males in the organization are graduating students. What is the probability that a: a.) student chosen at random is male or a graduating student? b.) students chosen at random is female ...
Friday, September 21, 2012 at 11:26am

statistics
A two-tailed test is conducted at the 5% significance level. What is the right tail percentile required to reject the null hypothesis? Show work to understand.
Friday, September 21, 2012 at 10:36am

statistics
A two-tailed test is conducted at the 5% significance level. What is the right tail percentile required to reject the null hypothesis?
Friday, September 21, 2012 at 10:25am

statistics
A two-tailed test is conducted at the 5% significance level. What is the right tail percentile required to reject the null hypothesis?
Friday, September 21, 2012 at 10:24am

statistics
how do i calculate the SAT score that defines the bottom 3% of students with a mean of 500 and standard deviation of 100
Thursday, September 20, 2012 at 12:00am

statistics
Professor Gensemer is canoeing down the Colorado River, trying to reach camp by nightfall. To get that far, she must paddle successfully through 6 sections of white water rapids. For each section, if she reaches that sections there is a probability .1 of her capsizing and ...
Wednesday, September 19, 2012 at 11:56pm

statistics
Suppose a college's SAT scores are normally distributed with mean 1000 and standard deviation 1 for students above 1200. What percentage of students is eligible for scholarships
Wednesday, September 19, 2012 at 2:55pm

statistics
Healthy breakfast contains the rating of 77 cereals and the number of grams of sugar contained in each serving. A simple linear regression model considering "sugar" as the explanatory variable and "rating" as the response variable produced the following ...
Wednesday, September 19, 2012 at 12:17am

statistics
Pre study scores versus post-study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least square regression line was y = 0.2 + 0.9x with a correlation coefficient r = 0...
Tuesday, September 18, 2012 at 11:59pm

statistics
Use the following information to calculate the lower and upper fence: A teacher was interested in how many text messages teenagers got per day. He randomly selected 70 students and asked them how many text messages they received the previous day. The mean (x)=23.1 standard ...
Tuesday, September 18, 2012 at 11:38pm

statistics
If a distribution is skewed, should the mean must be smaller than the median?
Tuesday, September 18, 2012 at 11:24pm

statistics
Can categorical data be graphed using a boxplot?
Tuesday, September 18, 2012 at 11:22pm

statistics
A correlation of 0 always means there is no relationship between x and y true or false?
Tuesday, September 18, 2012 at 11:21pm

statistics
Is another name for an explanatory variable an independent variable?
Tuesday, September 18, 2012 at 11:17pm

statistics
standard deviation is not resistant to outliers true or false?
Tuesday, September 18, 2012 at 11:15pm

statistics
Is weight an example of a discrete variable?
Tuesday, September 18, 2012 at 11:13pm

Statistics
A survey of 815 students is asked whether or not they have cable TV and Internet cable in their rooms at home. Results of the survey showed that 69% of students has cable TV, 58% of students has Internet cable and 37% of students has both cable TV and Internet cable. Suppose, ...
Tuesday, September 18, 2012 at 10:42pm

Statistics
Wendy is a randomly chosen member of a large female population, in which 9% are pregnant. Wendy tests positive in a pregnancy test. Pregnancy test correctly identifies pregnancy 95% of the time and correctly identifies non pregnancy 92% of the time. What is the probability ...
Tuesday, September 18, 2012 at 10:41pm

probability and statistics
A 0.1μm diameter drop of 1mM protein solution is introduced into pure water centered at x. Assume proteins diffuse randomly by “stepping” a distance 0.1μm every millisecond. a. What is the density at x after 1 minute? b. How many protein molecules are there...
Tuesday, September 18, 2012 at 5:31pm

statistics
The box plot below summarize the distributions of SAT verbal and math scores among students at an upstate New York high school. 300 400 500 600 700 800 data Whic of the following statements is false? 1. The range of the math scores equals the range of the verbal scores. 2. The...
Tuesday, September 18, 2012 at 4:59pm

Probability and statistics
In a game you flip a coin twice, and record the number of heads that occur. You get 10 points for 2 heads, zero points for 1 head, and 5 points for no heads. What is the expected value for the number of points you’ll win per turn?
Tuesday, September 18, 2012 at 4:28pm

Probability and statistics
A mysterious card-playing squirrel (pictured) offers you the opportunity to join in his game. The rules are: To play you must pay him $2. If you pick a spade from a shuffled pack, you win $9. Find the expected value you win (or lose) per game.
Tuesday, September 18, 2012 at 4:28pm

Probability and statistics
There is an equally likely chance that a falling dart will land anywhere on the rug below. The following system is used to find the number of points the player wins. What is the expected value for the number of points won?Black = 40 points Gray = 20 points White = 0 points
Tuesday, September 18, 2012 at 4:26pm

Probability and statistics
A dice game involves rolling 2 dice. If you roll a 2, 3, 4, 10, 11, or a 12 you win $5. If you roll a 5, 6, 7, 8, or 9 you lose $5. Find the expected value you win (or lose) per game.
Tuesday, September 18, 2012 at 4:25pm

Statistics
A standard deck of cards contains 52 cards. Of these, 12 are face cards (kings, queens, and jacks), 13 are hearts, 13 are clubs, and 3 of these are both hearts and face cards. A card is drawn. What is the probability that the card is either a jack of hearts or a queen of clubs?
Tuesday, September 18, 2012 at 2:57am

Statistics
A group of 20 preschoolers were tested on reading readiness. The mean on this test is 30.9, with SD=2.08. What percentage of children scored between 25 and 28.5?
Monday, September 17, 2012 at 10:34pm

statistics
Write a brief paragraph describing the distribution of the variables, Population in thousands (populatn) and the average female life expectancy (lifeexpf) for the countries. Descriptive Statistics Population in thousands Average female life expectancy Valid N (listwise) N 109 ...
Monday, September 17, 2012 at 2:05pm

SCI207
In-place fossil fuel resource statistics can be misleading because
Sunday, September 16, 2012 at 10:47pm

statistics
The following is the tabulated data of the monthly commissions of the sales employees at La Verne Inc. Establish the frequency distribution. Present the data in a histogram format, draw the frequency polygon and the ogive (or cumulative polygon)
Sunday, September 16, 2012 at 7:43pm

statistics
Five thousand raffle tickets are to be sold at $10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value Automobile 1 $20,000 ...
Sunday, September 16, 2012 at 7:15pm

Statistics
AJ DAVIS is a department store chain, which has many credit customers and wants to find out more information about these customers. A sample of 50 credit customers is selected with data collected on the following five variables: LOCATION (Rural, Urban, Suburban) INCOME (in $1,...
Sunday, September 16, 2012 at 5:54pm

Statistics
The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem, determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.
Sunday, September 16, 2012 at 3:05pm

statistics
Each year, approximately 160 colleges compete in the National Concrete Canoe Competition. Each team must design a seaworthy canoe from a substance not know for it's capacity to float. The canoes must weigh between 100 and 350 pounds. Find the midrange weight.
Sunday, September 16, 2012 at 9:44am

statistics
Consider the following types of data that were obtained from a random sample of 49 credit card accounts. Identify all the averages that can be used to summarize the data.(Select all that apply) 1.Outstanding balance on each account: mode,median,mean?
Saturday, September 15, 2012 at 10:10pm

Statistics for healt professional
Calculate the sampling distribution parameters U=80,O=10,s=8,n=25
Saturday, September 15, 2012 at 11:59am

Help with Calculating Probabilities
Anon: Do you know how to calculate probabilities like P10, P20, P30...? I do not understand lot of this statistics stuff and desperately need help. Thanks
Thursday, September 13, 2012 at 10:12pm

Statistics
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 167 and a variance of 9. The material is considered defective if the breaking strength is less than 158 pounds. What is the probability that a single, randomly selected piece ...
Thursday, September 13, 2012 at 9:48pm

statistics 251
how do i find the standard deviation and sample variance for $7448, $4911, $9051, $6374, $4227
Thursday, September 13, 2012 at 6:21pm

statistics
IQ scores are normally distributed with a mean of 105 and a standard deviation of 18. Assume that many samples of size n are taken form a large population of people and the mean IQ score is computed for each sample. If the sample size is n=64, find the mean and standard ...
Thursday, September 13, 2012 at 3:51pm

statistics
Suppose that a random variable, X, follows a Normal distribution. Specifically, X~N(10, 4). What is the value for the standard deviation
Thursday, September 13, 2012 at 9:28am

statistics
Suppose that a random variable, X, follows a Normal distribution. Specifically, X~N(10, 4). What is the value for the standard deviation
Thursday, September 13, 2012 at 9:07am

Statistics
If the interest rate is 3% and a total of $4,370.91 will be paid to you at the end of 3 yrars, what is the present value of that sum? my answer: $4,ooo.oo
Thursday, September 13, 2012 at 6:05am

statistics
On a given day the NYSE opening price per share for the 100 largest U.S. corporations has a mean of $385 and a median of $92. We can conclude A. The distribution of the price per share is symmetric, B. The distribution of the price per share is skewed to the right or is it ...
Thursday, September 13, 2012 at 2:33am

statistics
A teacher was interested in how many text messages teenagers got per day. He randomly selected 70 students and asked them how many text messages they reveived the previous day.?
Thursday, September 13, 2012 at 2:24am

statistics
Pre- study scores versus post- study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least squares regression line was y^=0.2+0.9x withwith a correlation coefficient r...
Thursday, September 13, 2012 at 2:20am

statistics
The data set healthy breakfast contains the ratings of 77 cereals and the number of grams of sugar contained in each searving. A simple linear regression model considering Sugar as the explanatory variable and Rating as the response variable produced the following regression ...
Thursday, September 13, 2012 at 1:39am

Business Math and Statistics
If the interest rate is 3% and a total of $4,370.91 will be paid to you at the end of 3 years, what is the present value of that sum ?
Wednesday, September 12, 2012 at 5:28pm

Statistics
Can you change this research question into a null hypothesis: What is the difference in students’ computer anxiety based on whether or not they own computers?
Wednesday, September 12, 2012 at 4:52pm

statistics
A student is taking a multiple choice test where each question have 5 possible answers of which only one is right. If the student knows the answer the student answers correctly, otherwise there is a 20% probability of correct answer. Assume the student knows 70% of the ...
Wednesday, September 12, 2012 at 3:30pm

statistics
10. A student is taking a multiple choice test where each question have 5 possible answers of which only one is right. If the student knows the answer the student answers correctly, otherwise there is a 20% probability of correct answer. Assume the student knows 70% of the ...
Wednesday, September 12, 2012 at 3:27pm

statistics
If a bag contains a set of 20 red balls, 10 green balls, and 15 black balls, then what is the possiblity of selecting (in this order) a red ball, a green ball, and a red ball. Without Replacement of the items selected. Can you explain how you get the answer? Thank you
Wednesday, September 12, 2012 at 10:53am

statistics
What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?
Wednesday, September 12, 2012 at 1:47am

statistics
if the mean=100 and the standard deviation=8, calculate p(x>108)
Tuesday, September 11, 2012 at 9:39pm

STATISTICS
if the mean is 85 and the SD is 8 what percentage of students will receive a grade less than 58 and greater thAN 110
Sunday, September 9, 2012 at 9:32pm

Hypothesis Statistics
A two-tailed test is conducted at the 5% significance level. What is the P-value required to reject the null hypothesis?
Sunday, September 9, 2012 at 12:46am

Hypothesis Statistics
At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine...
Sunday, September 9, 2012 at 12:26am

statistics
I want to examine the relationship between gas mileage of cars and the engine size ( displacement in cubic inches). The explanatory variable is?
Thursday, September 6, 2012 at 1:19pm

statistics
I want to examine the relationship between gas mileage of cars and the engine size ( displacement in cubic inches). The explanatory variable is?
Thursday, September 6, 2012 at 1:16pm

statistics
The ABC Company has been evaluating the performance of two advertising agencies it deals with. They produce the following scatterplot of sales against advertising expenditures.
Thursday, September 6, 2012 at 1:12pm

statistics
The data in the scatterplot below are an individual' s weight and time it takes ( in seconds) on a tredmill to raise their pulse rate to 140 per minute. The o' s correspond to females and the +'s to males.
Thursday, September 6, 2012 at 1:07pm

statistics
I wish to determine the correlation between the height ( in inches) and weight ( in pounds) of 21 year old males. To do this , i measure the height and weight of two 21 year old men. The measured values are?
Thursday, September 6, 2012 at 1:02pm

statistics
The lifetime of a 2- volt non- rechargeable battery in constant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. What is the z-score for batteries with lifetimes of 600 hours?
Thursday, September 6, 2012 at 12:58pm

statistics
The lifetime of a 2- volt non-rechargeable battery in constant use has a normal distribution of 516 hours and a standard deviation of 20 hours. What is the z- score for batteries with lifetimes of 520 hours?
Thursday, September 6, 2012 at 12:54pm

Statistics
(TCO A) Consider the following age data, which is the result of selecting a random sample of 20 United Airlines pilots. 47 45 45 52 58 55 58 44 42 38 45 52 48 47 51 45 52 42 37 40 a. Compute the mean, median, mode, and standard deviation, Q1, Q3, Min, Max for the above sample ...
Thursday, September 6, 2012 at 10:54am

Statistics
An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a Normal distribution ...
Wednesday, September 5, 2012 at 11:19pm

story
Investment reports often include correlations. Following a table of correlations among mutual funds , a reports add," Two funds can have perfect correlation, yet differnet levels of risk. For example, Funda A and Fund B may be perfectly correlated, yet fund A moves 20% ...
Wednesday, September 5, 2012 at 10:12pm

statistics
for mu homework, we are making histograms. on the assignment, we need to list the class limits, class boundaries, midpoint, frequency and relative frequency for each class. i know how to find all of those except for the midpoint since we were not taught this in class. care to ...
Wednesday, September 5, 2012 at 8:19pm

statistics
Research reports a correlation of +0.8 between math achievement and math aptitude it also reports a correlation of -0.8 between math achievement and a math anxiety. Which interpretations is most c?orrect
Wednesday, September 5, 2012 at 1:28am

statistics
A student computes the correlation between two variables in a spreedsheet and finds r= 0.06.Is there a relationship between the variables?
Wednesday, September 5, 2012 at 1:24am

statistics
If a certain species of female lizard mate males that are .75 years younger what would the correlation between the ages of the males and female lizard be?
Wednesday, September 5, 2012 at 1:19am

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