Tuesday

March 31, 2015

March 31, 2015

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics**

If bird flu mortality in one sample of 100 is 20% and in another sample of 100 it is 30%. Is the difference in mortality rate is significant? Solve for the statistic value of Z at probability alpha level of 0.05. Please show your solution.
*Friday, March 6, 2015 at 8:28am*

**statistics**

A survey found that women's heights are normally distributed with mean 62.4 in and standard deviation 2.8 in. The survey also found that men's heights are normally distributed with a mean of 68.9 in. and standard deviation 2.8. Complete parts a through c below. a. Most...
*Thursday, March 5, 2015 at 4:35am*

**Statistics/Probability**

A certain brand of candies have a mean weigh of 0.8576 g and a standard deviation of 0.0523. A sample of these candies came from a package containing 447 candies,and the package label stated the net weight is 381.3 g. (If every package has 447 candies, the mean weight of the ...
*Thursday, March 5, 2015 at 3:54am*

**Statistics/Probability**

Assume that women’s heights are normally distributed with a mean given by μ = 63.4 in, and a standard deviation given by σ = 2.3 in. (a) If 1 woman is randomly selected, find the probability that her height is less than 64 in. (b) If 43 women are randomly ...
*Wednesday, March 4, 2015 at 11:48pm*

**statistics/normal distribution**

Find the area of the shaded region.The graph to the right depicts IQ scores of Adults (85-120), and those scores are normally distributed with a mean of 100 and a standard deviation of 15
*Wednesday, March 4, 2015 at 7:45pm*

**Statistics Help**

Express the confidence interval (0.024, 0.112) in the form of p-hat – E < p < p-hat + E = __< p < __ I don't understand how to perform this formula. Please help I am about to graduate and this is my last class, and I am struggling as I only know basic Math...
*Wednesday, March 4, 2015 at 3:18pm*

**statistics/Help Please!!**

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained:0.18, 0.12, 0.05, 0.19, 0.18,0.13, 0.15. Assuming that this sample is representative of the cars in use, construct a 98% confidence interval ...
*Wednesday, March 4, 2015 at 1:10pm*

**statistics**

one bag contains 4 white balls,2 black balls.another bag contains 3 white balls 5 black balls.if one ball is drawn from each bag. find that a) both are white? b) both are black? c)one is white and one is black?
*Wednesday, March 4, 2015 at 12:53am*

**Statistics**

. Given that x is a normal variable with mean m=110 and standard divation (r=12, find P(x=≤120
*Wednesday, March 4, 2015 at 12:12am*

**Statistics**

A random sample of state gasoline taxes is shown for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 0.21? assume normal distribution.
*Tuesday, March 3, 2015 at 12:08pm*

**Statistics **

find the probability that you will get a "sum" of 5 or greater in rolling two dice experiment. How do you do this?
*Tuesday, March 3, 2015 at 10:29am*

**businessmath**

Statistics show that the sales force of a certain company successfully closed 986 sales out of 1,700 sales calls. What was their percent success rate? If needed, enter decimals rather than fractions. Do not enter the percent symbol in your answer.i need the answer now
*Tuesday, March 3, 2015 at 9:51am*

**businessmath**

Statistics show that the sales force of a certain company successfully closed 986 sales out of 1,700 sales calls. What was their percent success rate? If needed, enter decimals rather than fractions. Do not enter the percent symbol in your answer.
*Tuesday, March 3, 2015 at 9:50am*

**Statistics**

so we will be having a quiz about hypotheses testing and i cant still figure out the difference between the null hypothesis with alternative hypothesis. PLEASE HELP ME DIFFERENTIATE THE TWO. And i still get confused between one tailed test and two tailed test.. what's the ...
*Tuesday, March 3, 2015 at 8:11am*

**Statistics**

what is the cost of a dinner when there is a 0 rating when y hat=1.6+2.9x
*Monday, March 2, 2015 at 5:41pm*

**Statistics**

How does the standard deviation differ to of the sample mean x bar. Please help I'm confused
*Monday, March 2, 2015 at 8:44am*

**statistics**

The life spans of three randomly selected tires are 28,100 miles, 37,900 miles, and 33,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
*Sunday, March 1, 2015 at 5:55pm*

**statistics**

Fewer young people are driving. In 1983, 87 percent of 19 year-olds had a driver's license. Twenty-five years later that percentage had dropped to 75 percent (University of Michigan Transportation Research Institute website, April 7, 2012). Suppose these results are based ...
*Sunday, March 1, 2015 at 5:41pm*

**statistics**

In a test of the effectiveness of garlic for lowering cholesterol, 44 subjects were treated with garic in a processed tablet form. Cholesorol levels were measured before and after the treament. the changes in their levels of LDL cholestorol (in mg/dL have a mean of 3.5 and a ...
*Sunday, March 1, 2015 at 10:09am*

**Statistics/check answer**

If a population has a standard deviation σ of 18.2 units, what is the standard error of the mean if samples of size 25 are selected? Show all work. standard error of the mean = 0/sqrt(n) = 18.2/sqrt(25) = 18.2/5 =3.64 Answer 3.64
*Sunday, March 1, 2015 at 5:59am*

**statistics**

Suppose for the same 3000 women, we also measured their weight. Suppose the data were again normally distributed. The average weight is 143 lbs., and the standard deviation is 30 lbs. Suppose the correlation between height and weight is r = +.69. What is the slope of the best-...
*Sunday, March 1, 2015 at 3:03am*

**Statistics**

Suppose that the distance of fly balls hit to the outfield (in baseball)is normally distributed with a mean of 250 feet and a standard deviation of50 feet. a. If X = distance in feet for a fly ball, then X ~ _____(_____,_____) b. If one fly ball is randomly chosen from this ...
*Sunday, March 1, 2015 at 1:54am*

**Statistics**

How many different 9 letter code words can be made using the symbols %%%% &&& ++
*Sunday, March 1, 2015 at 12:29am*

**Statistics**

Science scores for high school seniors in the United States are normally distributed with a mean of 78 and a standard deviation of 10. Students scoring in the top 10% are eligible for a special prize consisting of a laptop and $2,000. What is the approximate cutoff score a ...
*Saturday, February 28, 2015 at 9:29pm*

**statistics**

how to summarize statistic assumption
*Saturday, February 28, 2015 at 12:56pm*

**statistics**

If weight in the general population is normally distributed with an average of 160 and a standard deviation of 20 pounds, what is the probability of selecting someone who weights 120 or less or 170 or more pounds?
*Friday, February 27, 2015 at 7:46pm*

**statistics**

Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation: z(α/2) = 1.96
*Friday, February 27, 2015 at 7:35pm*

**Statistics **

With a known population mean of 100, and a known standard of error of the mean of 7.5, what is the probability of selecting at random a sample whose mean is equal to 110 or greater?
*Friday, February 27, 2015 at 6:53pm*

**statistics**

historically, the average customer spends $8.53 for all TGP restaurants(u=8.53). If the population standard deviation is $1.06(o=1.06) and the data is normally distributed, find the probabiltiy that the sample mean will be within $.15 of the populaiton mean using a sample size...
*Friday, February 27, 2015 at 6:40pm*

**statistics**

Assume that the regression equation for the relationship between SAT scores and IQ scores is y = 9 +.105x. What would you expect the IQ score to be for the following individuals, given their SAT scores? Individual SAT Score IQ Score Susan 850 Sally 1175 Sam 1225 Sean 1050
*Friday, February 27, 2015 at 6:31pm*

**Healthcare Statistics**

What is the mode of this data set 22 27 32 32 35 35 36 37 38 42 48 52 53 54 55 55 55 58 59 62 62 63 64 65 65 65 67 69 75 84 I see four modes: 32, 35, 55, and 65 Would this be considered multimodal?
*Friday, February 27, 2015 at 6:16pm*

**statistics**

For classes of 273 students, find the mean and standard deviation for the number born on the 4th of July, Ignore leap years. For a class or 273 students, would two be an unusually high number who were born on the 4th of July? I don't know how to find how many out of 273 ...
*Friday, February 27, 2015 at 4:13pm*

**statistics**

A headline in a certain newspaper states that "most stay at first job less than 2 years." That headline is based on an online poll of 320 college graduates. Among those polled, 72% stayed at their first full-time job less than 2 years. a. Assuming that 50% is the ...
*Friday, February 27, 2015 at 4:00pm*

**Statistics **

The results of a nationwide survey show that 57.40% of college students have violated rules of alcohol use. The margin of error for the survey is 2.30%. What does this mean?
*Friday, February 27, 2015 at 1:23pm*

**Statistics**

Among the population of criminal justice students, the average score on the final exam was 74, with a standard deviation of 11.6. What is the probability of randomly selecting a student who earned an A (90 or better)?
*Friday, February 27, 2015 at 1:21pm*

**Statistics **

1200 high school freshman were randomly selected for a national survey. Among survey participants, the mean grade-point average was 2.8, and standard deviation was 0.6. What is the margin of error, assuming a 95% confidence level?
*Friday, February 27, 2015 at 1:18pm*

**Statistics**

A criminologist is studying school violence, she selects a random sample of 25 adolescents aged 12 to 15 from a local middle school and asks the following,"How many times within the past school year have you been physically assaulted at school? She calculated the ...
*Friday, February 27, 2015 at 1:15pm*

**Statistics**

Suppose we would like to estimate the mean amount of money spent on books by students in the fall semester. We have the following data from 400 randomly selected students: mean=$205 and s=$40. Assume that the amount spent on books by students is normally distributed. Compute a...
*Friday, February 27, 2015 at 9:18am*

**Statistics**

Let x and y be the amounts of time (in minutes) that a particular commuter must wait for a train on two independently selected days. Define a new random variable w by w = x + y, the sum of the two waiting times. The set of possible values for w is the interval from 0 to 2a (...
*Friday, February 27, 2015 at 2:12am*

**statistics**

Heights of men on a baseball team have a bell-shaped distribution with a mean of 169 cm and a standard deviation of 9 cm. Using the empirical rule, what is the approximate percentage of the men between the following values? a. 151 cm and 187 cm. b. 160 cm and 178 cm. Please ...
*Thursday, February 26, 2015 at 1:03pm*

**statistics**

In a course there is a midterm exam, worth 40% of the course grade, and a final exam worth 60%. On the midterm the mean grade was 80 with a standard deviation of 10, and on the final the mean was 75 with a standard deviation of 15. The correlation between the two exams is 0.6...
*Wednesday, February 25, 2015 at 11:20pm*

**STATISTICS**

a team of 3 is to be chosen from 4 boys and 5 girls. if X is the random variable of the number of girls in the team find the Expected variable X. E(X)
*Wednesday, February 25, 2015 at 3:40pm*

**statistics/normal distribution**

If np is greater than or equal to 5, and nq is greater than or equal to 5, estimate P(fewer than 8) with n =14 and p = 0.6 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq < 5, then state that the normal approximation is ...
*Wednesday, February 25, 2015 at 3:01pm*

**Statistics**

What is the sample variance (not the population estimate) for: 1, 1, 2, 3, 5, 8.
*Tuesday, February 24, 2015 at 9:53pm*

**Statistics**

In a nominal data set, what is the preferred measure of central tendency?
*Tuesday, February 24, 2015 at 9:40pm*

**statistics**

I know I posted this earlier but I found the answer I just don't know the steps to find it. Use technology to find the probability associated with the cumulative area to the left of the z score of the adjusted value of x, 5.5. P(z < - 0.5546) = 0.2896 If you could just ...
*Tuesday, February 24, 2015 at 5:56pm*

**Statistics**

A vending machine pours an average of 8.0 oz of coffee with a standard deviation of 0.2 oz if it is functioning properly. An inspector wants to take 16 cups of coffee from the machine to see if the machine is functioning well or not. He wants to have a significance level of 4...
*Tuesday, February 24, 2015 at 5:15pm*

**statistics**

use technology to find the probability associated with the cumulative area to the left of the z score of the adjusted value of x, 5.5 P(z< - 0.5546) = Im not sure if I need to look a z score table or how to redo this formula. I know the steps except for this. Please help.
*Tuesday, February 24, 2015 at 4:55pm*

**Statistics and Probability**

I took a large sample of households in a city, and based on that, estimate the standard deviation of the income for all households in the city is $800. In order to make a desired conclusion about the income for all the households in the city, I want the sample mean for another...
*Tuesday, February 24, 2015 at 4:34pm*

**Statistics**

I took a large sample of households in a city, and based on that, estimate the standard deviation of the income for all households in the city is $800. In order to make a desired conclusion about the income for all the households in the city, I want the sample mean for another...
*Tuesday, February 24, 2015 at 3:56pm*

**statistics**

If np is more or equal to 5 and nq is more or equal to 5, estimate P(fewer than 6) with n = 14 and p = 0.5 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq < 5, then state that the normal approximation is not suitable. ...
*Tuesday, February 24, 2015 at 4:35am*

**statistics**

A box contains 3 red marbles and 7 white marbles.A marble is drawn from the box,and a marble of the other color is then put into the box.A second marble is drawn from the box.Find the probability that the second marble is red.if both marbles were of same color.what is the ...
*Tuesday, February 24, 2015 at 3:25am*

**statistics**

A comprehensive study of orphaned children is conducted in every orphanage in Australia. A scale called the Capacity for Attachment Scale is given to all orphaned children. The mean (μ) of the scale is 72 and the standard deviation (σ) is 13. Assuming that the scores...
*Monday, February 23, 2015 at 7:05pm*

**statistics**

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with the drug and will die (iii) Not treated with...
*Sunday, February 22, 2015 at 10:42pm*

**statistics**

The water supply in a town depends entirely on two pumps. A and B. The probability of pump A filling is 0.1 and the probability of pump B failing is 0.2. Calculate the probability that (a) Both pumps are working (b) There is no water in the town (c) Only one pump is working (d...
*Sunday, February 22, 2015 at 8:01pm*

**statistics**

About 71% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents. Round to four decimal places.
*Sunday, February 22, 2015 at 4:07pm*

**statistics**

A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day. The results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. Based on ...
*Sunday, February 22, 2015 at 1:15pm*

**statistics**

Consider the following situation, and answer each of the following multiple choice questions. In your write-up, just list the sub-question letter (A-J) and your answer – no need to restate the question or to justify your answer. Situation: You have 400 data points, which ...
*Sunday, February 22, 2015 at 7:09am*

**statistics**

a hat contains 40 marbles, 16 of which are red and are green. if one marble is randomly selected out of this hat, what is the probability that this marble is red?
*Sunday, February 22, 2015 at 6:55am*

**statistics**

Factories A, B and C produce computers. Factory A produces 3 times as many computers as factory C, and factory B produces 6 times as many computers as factory C. The probability that a computer produced by factory A is defective is 0.02, the probability that a computer ...
*Sunday, February 22, 2015 at 1:43am*

**statistics**

A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler.
*Saturday, February 21, 2015 at 8:05pm*

**Statistics**

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
*Saturday, February 21, 2015 at 6:11pm*

**statistics**

A student government representative at a local university claims that 60% of all the undergraduate students favor a move to Division I in college football. A simple random sample of 250 undergraduate students is selected. What is the probability that the sample proportion ...
*Saturday, February 21, 2015 at 3:45pm*

**statistics**

Heights of women have a bell-shaped distribution with a mean of 158 cm and a standard deviation of 8 cm. Using Chebyshev’s theorem, what do we know about the percentage of Women with heights that are within 3 standard deviations of the mean. What are the minimum and ...
*Saturday, February 21, 2015 at 3:58am*

**govt**

what is the correct apa style that i would use in a biblography for the u.S. bureau of labor statistics (february 2012)
*Friday, February 20, 2015 at 9:01pm*

**Statistics**

A student guesses blindly on a 20-question multiple choice test. If each question has 4 answer choices (only one of which is correct), what is the probability that the student will answer exactly 10 questions correctly?
*Friday, February 20, 2015 at 8:11pm*

**statistics**

Determine the critical region and the critical values used to test the following null hypotheses: a. Ho: μ = 55 (≥), Ha: μ < 55, α = 0.02 b. Ho: μ = −86 (≥), Ha: μ < −86, α = 0.01 c. Ho: μ = 107, Ha: μ &#...
*Friday, February 20, 2015 at 2:53pm*

**Statistics**

Below are the numbers of games played in the World Series from 1903 to 2012. Find the mean, variance and standard deviation. Games played Probability 4 0.186 5 0.231 6 0.203 7 0.341 8 0.039
*Friday, February 20, 2015 at 1:25pm*

**Statistics**

For $5 you can buy a ticket for a drawing for a prize of $2,000. The probability of winning the prize is 0.001. How much money to you expect to win
*Friday, February 20, 2015 at 1:20pm*

**statistics**

A candy company claims that 13% of its plain candies are orange, and a sample of 100 such candies is randomly selected. Find the mean and the standard deviation for the number of orange candies in such groups of 100. I do not get the formula to figure this out Someone, please ...
*Friday, February 20, 2015 at 5:44am*

**statistics**

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.42. The table on the right describes the probability of having x number of girls. Determine whether the table describes a probability ...
*Friday, February 20, 2015 at 5:43am*

**statistics**

When drawing a histogram, it is important to a. eliminate the extremes to minimize the effect of skewness. b. choose class intervals, so they all have the same number of observations c. make sure that the mean and the median fall in the same class interval, so that the correct...
*Friday, February 20, 2015 at 4:36am*

**statistics**

A brand has 50% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 6 randomly selected customers, what is the probability that exactly 5 of the selected consumers recognize the brand name? I need the correct formula in...
*Friday, February 20, 2015 at 2:55am*

**statistics**

Estimate the multiple linear regression equation relating number of cups of coffee per week, female sex, and number of hours of exercise per week, considered simultaneously, to GPA. Consider GPA the dependent, or outcome variable. my answer: GPA= 7.301 -1.649 (female sex) -0....
*Friday, February 20, 2015 at 12:41am*

**Statistics **

Use the 5-step hypothesis testing framework to answer the following 2 questions: Step One: Stating the hypothesis Step Two: Choosing the appropriate test statistic Step Three: Developing a decision rule Step Four: Calculating the value of the test statistic Step Five: Stating ...
*Thursday, February 19, 2015 at 10:15pm*

**statistics**

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.46. The table describes the probability of having x number of girls.Determine whether the table describes a probability distribution. If...
*Wednesday, February 18, 2015 at 7:18am*

**statistics**

Five males with a particular genetic disorder have one child each. the random variable x is the number of children among the five who inherit the genetic disorder. Determine whether the table describes a probability distribution. If it does, find the mean and standard ...
*Wednesday, February 18, 2015 at 7:06am*

**statistics**

A candy company claims that 11% of its plain candies are orange, and a sample of 200 such candies is randomly selected a. find the mean and standard deviation for the number of orange candies in such groups of 100. use the formulas below to calculate the mean and standard ...
*Wednesday, February 18, 2015 at 6:19am*

**statistics**

Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean μ and standard deviation σ. Also, use the range rule of thumb to find the minimum usual value &#...
*Wednesday, February 18, 2015 at 6:01am*

**Statistics**

A population has u=100 and o=20. If you select a single score from this population, on average, how close would it be to the population mean? Explain your answer. I don't understand the question itself. Please help.
*Tuesday, February 17, 2015 at 7:46pm*

**statistics**

In testing the hypotheses H0: = 0.40, H1: > 0.40 at the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .05, the appropriate conclusion would be
*Tuesday, February 17, 2015 at 6:09pm*

**statistics**

S) Suppose we want to determine the (binomial) probability (p) of getting 5 heads in 15 flips of a 2-sided coin. Using the Binomial table in the appendix of the text, what values of n, x, and p would we use to look up this probability, and what would be the probability? n=...
*Tuesday, February 17, 2015 at 7:18am*

**Statistics**

Approximately 6% of the male population is color blind. If a random sample of 250 male adults is tested for color blindness, what is the probability that at least 10 but no more than 20 will be color blind?
*Tuesday, February 17, 2015 at 2:25am*

**Statistics **

Can someone please separate this terms by categorical variable and numerical variable: Region Population Growth Rate Adult Literacy Measles Immunity Male Life expectancy Female life expectancy Male Healthy Average Life Expectancy Female Healthy Average Life Expectancy
*Monday, February 16, 2015 at 8:24pm*

**statistics **

From Lab 3, Problem 2 2. The data set magnet is from an experiment to see the effect of voltage and number of turns on the magnetic force of an electromagnet. The experimenters expected to see a limit to which the number of turns could increase the force. (This is actually a ...
*Monday, February 16, 2015 at 4:13pm*

**Statistics**

Anger and Snap Judgments Read the article entitled “Anger Can Cause Snap Judgments” and answer the following questions. ANGER CAN CAUSE SNAP JUDGMENTS Anger can make a normally unbiased person act with prejudice, according to a forthcoming study in the journal ...
*Monday, February 16, 2015 at 4:11pm*

**statistics**

if you earned a 17 on a quiz what would your score indicate the best performance a. x=15 and s=2.4 b. x=15 and s=2.1 c. x=17 and s=2.4 d. x=17 and s=2.1
*Sunday, February 15, 2015 at 8:06pm*

**statistics**

A teacher is interested in finding out how many hours a day a college student at Monroe Community College exercises. The teacher randomly chooses 1000 college students and asks them, “How many hours do you exercise?” Explain whether there could be any bias in the ...
*Sunday, February 15, 2015 at 8:04pm*

**Statistics**

A linear regression of price on square footage of homes for sale found the equation price = 30275 + 144*sqft. In this equation, the slope means A. a house with no square feet will cost $30,275. B. for every 144 square feet, average price goes up $30,275. C. for every square ...
*Sunday, February 15, 2015 at 5:07pm*

**statistics**

Listed below are the duration's (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or why not? 71, 100, 237, 199, 164, 269, 193, 379...
*Friday, February 13, 2015 at 1:35am*

**statistics**

Below are 36 sorted ages of an acting award winner. Find P10 converting a percentile to a data value 17 21 22 22 22 23 24 30 31 33 37 38 38 42 43 44 45 47 47 50 51 53 54 54 54 54 55 60 64 65 67 69 71 71 72 76 78 I am not sure how this system works and I searched my textbook ...
*Friday, February 13, 2015 at 1:22am*

** Statistics**

above average warmth extended over the east and southeast on Jan.13, 2005.The days forecasted high temperatures in four cities in the affected area were as follows: Burlington, Vt. 55 degrees F, Durham, N.C. 74 degrees F, Williamsburg, Va. 74 Degrees F., and Augusta Ga., 75 ...
*Thursday, February 12, 2015 at 12:13pm*

**statistics**

One of the tallest living men has a height of 263 cm. One of the tallest living women is 245 cm tall. Heights of men have a means of 177 cm and a standard deviation of 8 cm. Heights of women have a mean of 163 cm and a standard deviation of 4cm. Relative to the population of ...
*Wednesday, February 11, 2015 at 7:24am*

**statistics**

Listed below are the duration's (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or why not? 71 100 237 199 164 269 193 379 252 233...
*Wednesday, February 11, 2015 at 7:15am*

**statistics**

Identify the level of measurement of the data and explain what is wrong with the given calculation. In a set of data, movie ratings are represented as 100 for 1 star, 200 for 2 stars, and 300 for 3 stars. the average (mean) of the 527 movie ratings is 231.2 Don't get this ...
*Tuesday, February 10, 2015 at 2:55pm*

**statistics**

A polling company reported that 53% of 2302 surveyed adults said that they play basketball.a. what is the exact value that is 53% of 2302? b. could the result from part (a) be the actual number of adults who said that they play basketball? why or why not? c. What could the ...
*Tuesday, February 10, 2015 at 2:42pm*

**Statistics**

The time to fly between New York City and Chicago is normally distributed with a mean of 180 minutes and a standard deviation of 17 minutes. What is the probability that a flight is more than 200 minutes?
*Tuesday, February 10, 2015 at 12:02pm*

**statistics**

The response to a question has three alternatives: A, B, and C. A sample of 120 responses provides 52 A, 29 B, and 39 C responses. Show the frequency and relative frequency distributions (use nearest whole number for the frequency column and 2 decimal for the relative ...
*Tuesday, February 10, 2015 at 9:17am*

**statistics**

An automotive manufacturer has selected 10 car seats to study the Rockwell hardness of the seat recliner mechanism. A sample of 8 has an average of 44.795 and a standard deviation of 0.402. At 95% percent confidence level, what is the interval for the population mean?
*Monday, February 9, 2015 at 11:48pm*

**statistics**

A sample distribution (closely approximating a normal distribution) of a critical part dimension has an average of 11.85 inches and a sample standard deviation of 1.33 inches. The lower specification limit is 11.41 inches. The upper specification limit is 12.83 inches. What ...
*Monday, February 9, 2015 at 11:44pm*

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