Monday
February 20, 2017

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
Find the area under the standard normal curve between z = 0 and z = 1.37.
Saturday, February 18, 2017 by Sharon

Language Arts
Hi! I just need someone to check my work please! :) Thanks! 1. Which of these is the defining characteristic of a comparison-and-contrast essay? A. Clear thesis statement. B. Organizational structure. C. Reliable sources. D. Similarities and differences between two or more ...
Friday, February 17, 2017 by Emma

Statistics
Find the area under the standard normal curve between z = 0 and z = 1.37.
Thursday, February 16, 2017 by Sharon

math statistic
One of your friends knows that you are taking Advanced Placement Statistics and asks for your help wither Chemistry lab report. She has come up with five measurements of the melting point of a compound: 122.4, 121.8, 122.0, 123.0, and 122.3 degrees Celsius. a. The lab manual ...
Thursday, February 16, 2017 by rhinechilde

Statistics
The probability that a randomly selected two-year-old male stinkbug will live to be three years old is .59963 what is the probability that to randomly selected two-year-old male stinkbugs will live to be three years old? What is the probability that for randomly selected two-...
Wednesday, February 15, 2017 by Audrey

statistics and probability
n a written test given to a large class comprising 42 students, the test scores were found to be normally distributed with a mean of 78 and a standard deviation of 7. A minimum score of 60 was needed to pass the test. A score of 90 or greater was needed to earn an A in the ...
Tuesday, February 14, 2017 by faye

statistics and probability
A company has been studying the performance of their sales department. The measure of performance used is: average monthly sales amount in dollars. For the past 12 months, the average monthly sales amount has been $4,532 with a standard deviation of $386. Calculate the ...
Tuesday, February 14, 2017 by faye

statistics and probability
5. A fastener company is supplying washers to a manufacturer of kitchen appliances who has specified that the outside diameter be 0.500 ± 0.025 inch. Measurements made on 250 washers show that the process is in good statistical control, the diameters are normally distributed...
Tuesday, February 14, 2017 by faye

Math-Statistics
CAN SOMEONE HELP ME WITH THIS? A recent study found that, of the 1771 participants aged 12 to 19 in the National Health and Nutrition Examination Survey, 19.5% had some hearing loss (defined as a loss of 15 decibels in at least one ear). This is a dramatic increase from a ...
Tuesday, February 14, 2017 by Kate

Statistics
A bin of 35 manufactured parts contains 6 defective parts and 29 non-defective parts. A sample of size 5 parts is selected from 35 parts. Selected parts are not replaced. How many different samples are there of size five that contain exactly 2 defective parts? What is the ...
Tuesday, February 14, 2017 by Bryan

Statistics
Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be between...
Sunday, February 12, 2017 by Anonymous

Statistics for Finance
Question 3 [17 Marks) There are five (5) set of data; A to E is provided for this question. Each group will be assigned to analyze ONE dataset only and answer the questions below. The assigned dataset will be determined by your lecturer in separate announcement in MMLS. Below ...
Saturday, February 11, 2017 by MohammedFarhanKhan

Statistics
According to Chebyshev’s theorem, what proportion of a distribution will be with k=4 standard deviations of the mean? Show all work as to how to find this. I have no idea on how to do this. HELP!!!!
Friday, February 10, 2017 by Sharon

Statistics
I am having a really rough time figuring out how this expected value was found in this Chi Square problem. 272 flies had long normal wings 60 flies had dumpy wings I know it's going to be a 3:1 ratio, and I know that 272 and 60 are my observed variables. This is how the table ...
Thursday, February 9, 2017 by Ellie

Math Statistics
"In the United Kingdom's Lotto game, a player picks six numbers from 1 to 49 fir each ticket. Rosemary brought one ticket for herself and one for each of her four adult children. She had the lottery ticket. When the sic winning numbers were drawn, Rosemary was surprised to ...
Tuesday, February 7, 2017 by Katherine

statistics
On a entrance exam, the mean was 50 and standard deviation was 5. If Ricky's z-score was -1.5, what was his exam score? I don't have a clue how to start to answer this question...
Tuesday, February 7, 2017 by stephanie

statistics
The closing price of Schnur Sporting Goods Incv. common stock is uniformly distributed between $20 and $30 per share. Draw the uniform distribution. What are the height and base?
Saturday, February 4, 2017 by eric

statistics
You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic “average number of vehicles per household is 1.9.” Which average (mean, median, mode) would be best if: • You wanted to be ...
Friday, February 3, 2017 by Sharon

statistics
Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. * The nurses on the 5th floor record the medicines administered every day and report results to the doctors. don't understand at all
Friday, February 3, 2017 by Sharon

Statistics Math
Let A and B be two exclusive events with P(A)=.2 and P(B) =.3. Find P(A|B)
Thursday, February 2, 2017 by Nicole

Statistics
A teacher gives a reading skills test to a third-grade class of n = 25 at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores showed an average improvement of MD = 12.7 points...
Thursday, February 2, 2017 by Derek

Elementary statistics
Prove the demorgans second law (anb)'=(a'ub'). Sho that au(bnc)=(aub)n(auc).
Thursday, February 2, 2017 by Bulama dgn

Statistics (elementary probability theory)
In an examination 60 candidates offer maths, 80 offer english,and 50 offer physics, if 20 offer maths & english, 15 offer english & physics, 25 offer math & physics and 10 offer all the 3. How many students entered to the examination ?
Thursday, February 2, 2017 by Bulama dgn

Statistics
3 batteries are chosen at random from 15 batteries of which 5 are defective. Find the probability if: 1) none of 3 are defective 2) exactly one is defective 3) 2 defective and 1 non-defective 4) at least one is non-defective What should I do? Is it permutation or a combination...
Sunday, January 29, 2017 by Someonehunidshelp

statistics
. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?
Sunday, January 29, 2017 by DEBORAH SLIGH

statistics
For a sample of 50 days, George Murnen made an average of 5.02 calls per day. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?
Sunday, January 29, 2017 by DEBORAH SLIGH

statistics
Bill has completed a 10-question multiple-choice test on which he answered 7 questions correctly. Each question had one correct answer to be chosen from five alternatives. Bill says that he answered the test by randomly guessing the answers without reading the questions or ...
Saturday, January 28, 2017 by elegantina

Research
Are statistics of something considered to be a research ?
Thursday, January 26, 2017 by Art

Statistics
In group of three friends what is the probability that at least two have the same birthday?
Thursday, January 26, 2017 by mitch

Statistics
Ive downloaded 3 journal articles, i just neeed someone to help me identify the ststistical procedures used in each articles Can somebody who knows ststistics plesse help me... How do u want to read theses 3 short journsl articles? Plesse i beg u
Wednesday, January 25, 2017 by Joy

PSYDAG Statistics ( no computation)--help please
Hi first what are statistical tools? What are statistical procedures? can you give an example of each and a brief definition? next Our assignment is to look for 3 very short/short (as much as possible please)journal articles about psychology or anthropology or social ...
Wednesday, January 25, 2017 by Joy

Math, Statistics
If P(A)=.3 and P(B)=.45 find… P(A or B) if A and B are 1)mutually exclusive & 2)independent. Also, I need help understanding what independent and mutually exclusive means and what that does.
Tuesday, January 24, 2017 by Jillian

Statistics
If the standard deviation of a sample is 12 inches, then the variance is 144 sq. inches. Do you agree? Can you try?
Sunday, January 22, 2017 by Elegantina

Mental Health
If the correlation between one’s interest in statistics and being a “fun date” was –0.70, it would mean that: a. The higher someone’s interest was in statistics, the more likely it would be that he or she is a fun date b. The higher someone’s interest was in ...
Sunday, January 22, 2017 by A

behavior health
According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? a. 0.40 b. 0.50 c. 0.80 d. 0.90 I selected C for my answer 40/50 is the .80 If the correlation between one’s interest in ...
Sunday, January 22, 2017 by A

Statistics
An observation was drawn from a normally distributed population with mean 2.397 and standard deviation 0.612. If the observed value is 3.144, find the z-score.
Sunday, January 22, 2017 by Karyn

PsyDAG How can i inteview you?
remember that statistics assignment of ours? pleaseee
Saturday, January 21, 2017 by AJ

Data analysis statistics and probability
6. If the average temperature in February was 55°F arch was 64°F April was 74°F, and Ma was 85°F men which month had the smallest gain in average temperature over the previous month? A. February B. March C. April D. May
Tuesday, January 17, 2017 by Jancy

Math (misleading graphs) (Statistics)
When constructing a graph showing the population of two​ countries, an illustrator draws two different people with heights proportional to the populations. Identify a way in which the graph might be misleading. What is the general name for such graphs that use drawings of ...
Monday, January 16, 2017 by Ray

statistics
A random variable has aprobability function p(x)=kx; x=1,2,3,4,5.find the value of k, p(x>=3),compute mean and variance of x.
Sunday, January 15, 2017 by ahmed

Statistics
in a medical examination, 300 people undergo a height measurement and was found out that the average height of all are 150cm. if the standard deviation is 19, find the number of people that fall under the given conditions: a)with the height less than 132cm. b)with height from ...
Tuesday, January 10, 2017 by Ej

American Government
Please check my answers 1. Which kind of policy was the troubled asset relief program (TARP)? A. It was a fiscal policy and I could buy the federal government to prevent inflation B. It was a monetary policy enacted by the federal government to expand the economy C. It was a ...
Friday, January 6, 2017 by M

Statistics
A two-digit number is written down at random.Find the probability that the number will be A)Smaller than 20 B)Even C)Multiple of 5
Wednesday, January 4, 2017 by Rukhsar

Statistics
Add a carnival, you play ring toss game 30 times. It's only a dollar to play, and your chances of winning the five dollar prize are advertised at 15%! What are your expected winnings?
Monday, January 2, 2017 by Anonymous

Statistics
A population of values has a normal distribution with μ=76.6 and σ=43.9 You intend to draw a random sample of size n=142. Find P75, which is the score separating the bottom 75% scores from the top 25% scores.
Monday, January 2, 2017 by Zameer

Statistics
A driver comes to pick up members of your family for a family reunion. The van holds 7 people, not including the driver. Assuming that none of the babies will be riding in the van, how many different ways can 7 people be chosen to ride in the van?
Thursday, December 29, 2016 by muzammil yasin

Probability & Statistics
The life expectancy (in hours) of a fluorescent tube is normally distributed with a mean 8000 and a standard deviation 1000. Find the probability that a tube lasts for more than 11000 hours.
Friday, December 23, 2016 by Gen

Statistics
The monthly salaries (in thousands of dollars) of a sample of sales representatives are as follows: 13, 7, 10, 9, 8, 13 Find the standard deviation of this sample of monthly salaries. Round your answer to at least two decimal places.
Thursday, December 22, 2016 by Anonymous

College Statistics
How much should you invest each month in order to have $800,000 if your rate of return is 5.3% compounded monthly and you want to achieve your goal in 40 years? How much interest will you earn? How much should you invest each month in order to have $800,000 if you want to ...
Friday, December 16, 2016 by onlyzoe_!

statistics
construct a probability distribution for18 boys and 24 girls
Wednesday, December 14, 2016 by annonymous

statistics
0.95 of confidence find the confidence interval for the mean
Tuesday, December 13, 2016 by fara

statistics
0.95 degree of confidence find the confidence interval for the mean of the whole population
Tuesday, December 13, 2016 by fara

statistics
a normal distribution has a mean of 20 and a standard deviation of 10. Two scores are sampled randomly from the distribution and the second score is subtracted from the first. What is the probability that the difference score will be greater than 5?
Tuesday, December 13, 2016 by Velvet

english
What does the author achieve by mixing exact and approximate numbers in "A Contribution to Statistics?"
Sunday, December 11, 2016 by ilovegot7

Math check - Statistics
Can someone (preferably one of the long-term tutors) check my answers: Researchers trap 23 devils, and find that 18 of them are infected. Provide an estimate of disease prevalence. p-hat = (18/23)=0.783 Part II: assuming the same disease prevalence from above. If they trap 2 ...
Sunday, December 11, 2016 by Jeremy

statistics
Janet has a jar with 8 gold marbles 12 silver marbles and 4 bronze marbles is she chooses two marbles without replacement, what is the probability that she chooses two silver marbles. I think the answer is 11/46 but not sure how to work the prboem
Saturday, December 10, 2016 by tammy

Statistics
Profitability remains a challenge for banks and thrifts with less than $2 billion of assets. The business problem facing a bank analyst relates to the factors that affect return on assets(ROA), an indicator of how profitable a company is relative to its total assets. Data ...
Thursday, December 8, 2016 by Julie Nessa

statistics
Scores on the GRE​ (Graduate Record​ Examination) are normally distributed with a mean of 541 and a standard deviation of 101. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score between 238 and 844 The percentage of people taking the test ...
Thursday, December 8, 2016 by eric

Statistics
Assume the probability of certain material to be detective produced by a company is 0.1 to inspect 10 items are selected so, probability at least one is defective
Thursday, December 8, 2016 by A japar

Statistics
If the probability of randomly choosing a county resident from a class of students is 65%, what is the probability of selecting exactly 7 county resident out of a random group of 10 students?
Wednesday, December 7, 2016 by Kim

Statistics
Construct a 99% confidence interval for life expectancy of a new GE light bulb. 64 bulbs are randomly selected and a mean of 750 hours and a standard deviation of 20 hours is found. Assume the distribution of life expectancy is normally distributed.
Wednesday, December 7, 2016 by Sharon

Statistics
The heights of kindergarten children are normally distributed with a mean of 39.5 inches and a standard deviation of 3.8 inches. In a kindergarten class of 23 children, what is the probability that their mean height is between 38.1 and 41.2 inches?
Wednesday, December 7, 2016 by Jose Garcia

Math (statistics)
Suppose an employee starts working after completing her MBA at age 30 at a starting salary of $50,000. She expects an annual salary increase to be at minimum 1%, at maximum 5%, with a uniform distribution. Her retirement plan requires that she contribute 8% of her salary, and ...
Monday, December 5, 2016 by Jo

Statistics (Math 210)
Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) According to a local chamber of commerce, in 1993, 5.9% of local area residents owned more than five cars. A local car dealer claims that the ...
Sunday, December 4, 2016 by Chris

Statistics (Math 210)
Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) A manufacturer claims the standard deviation of salt in their meat is .5. An SRS of 18 samples shows the standard deviation (s)= .62 (alpha = ....
Sunday, December 4, 2016 by Chris

Statistics (Math 210)
Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) A manufacturer claims that the mean lifetime of its lithium batteries if 1200 hours. A homeowner selects 25 of there batteries and finds the ...
Sunday, December 4, 2016 by Chris

Statistics (Math 210)
Hi there, I am working on a few homework assignments and having trouble with a few questions. I sincerely appreciate any and all help! :) A bank claims that the mean waiting time in line is less than 4.1 minutes. A random sample of 60 customers has a mean of 4 minutes with a ...
Sunday, December 4, 2016 by Christa

statistics
10th grade New York public school students taking a standardized English test produced test scores that were normally distributed with a mean of 85 and a standard deviation of 4. Let x be a random variable that represents the test score of a student. Students whose test scores...
Sunday, December 4, 2016 by jill

Statistics
Thirty-three small communities in Connecticut (population near 10,000 each) gave an average of x = 138.5 reported cases of larceny per year. Assume that σ is known to be 42.9 cases per year. (a) Find a 90% confidence interval for the population mean annual number of reported ...
Saturday, December 3, 2016 by Amy

Statistics
Zhi and her friends needed to decide where to eat. They narrowed their options to eight restaurants, including Zhi's favorite restaurant, Merlin's. To decide where to go, Zhi flipped a coin three times to get eight possible outcomes, where each outcome corresponded to a ...
Friday, December 2, 2016 by Shim

Math/ Statistics
A group of data elements has a mean M and a standard deviation S. a) Find the new mean and the new standard deviation if a constant number C is added to each data element in the group? Explain thoroughly. b) Find the new mean and the new standard deviation if each data element...
Thursday, December 1, 2016 by Abigail

Statistics
The mean height of a certain kind of plant is 185 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 185. State the null hypothesis H0 and the alternative hypothesis H1 that ...
Wednesday, November 30, 2016 by Jimmy

statistics
John runs a computer software store. Yesterday he counted 133 people who walked by the store, 66 of whom came into the store. Of the 66, only 24 bought something in the store.
Tuesday, November 29, 2016 by G

Statistics
About 74% of young adult Internet users (aged 18 to 29) use social network sites. Suppose that a sample survey contacts an SRS of 2000 young adult Internet users and calculates the proportion p̂ in this sample who use social network sites.
Tuesday, November 29, 2016 by Steph

Statistics
Salaries of 50 college graduates who took a statistics course in college have a​ mean, x of $68,200. Assuming a standard​ deviation, σ​, of $12,279​, construct a 95% confidence interval for estimating the population mean μ.
Monday, November 28, 2016 by casey

statistics
At a cafeteria the customers arrive at an average of 0.3 per minute. The probability that a)exactly 2 customers arrive in a 10 minute span b)2 or more customers arrive in a 10 minute span c) one customer arrives in a 5 minute span and one customer arrives in the next minute..
Monday, November 28, 2016 by momina

statistics
Consider an upper-tail test of hypothesis for the difference in two population means. The sample data from the first population is: n = 50, x-bar = 110, s = 10. The sample data from the second population is: n = 75, x-bar = unknown, s = 11. We conclude the alternative ...
Monday, November 28, 2016 by zac

Statistics
18 of the 50 dvrs in an inventory are known to be defective. What is the probability you randomly select an item that is not defective?
Saturday, November 26, 2016 by Nae

Statistics
A box contains 4 red marbles and 5 blue marbles. Michelle picks 3 marbles at a random. If Z is the random variable, representing the number of blue marbles picked from the box. Do the ff: A. Express the probability function in tabular and formula form. B. Complete the ...
Wednesday, November 23, 2016 by Eggy

Statistics
A cooperation must appoint a president, CEO, coo, CFO. There are 15 qualified candidates. How many ways can the officers be appointed?
Tuesday, November 22, 2016 by Nae

STATISTICS
A die is biased and the probability, p , of throwing a six is known to be less than 1 6 . An experiment consists of recording the number of sixes in 25 throws of the die. In a large number of experiments the standard deviation of the number of sixes is 1.5. Calculate the ...
Tuesday, November 22, 2016 by NTEEDZI

STATISTICS
In the mass production of bolts it is found that 5% are defective. Bolts selected at random and put into packets of ten. A packet is selected at random. Find the probability that it contains (a) three defective bolts. (b) less than three are defective. Two packets are selected...
Tuesday, November 22, 2016 by NTEEDZI

Statistics
Please help I don't know how to solve this problem : Trevor is interested in purchasing the local hardware/sporting goods store in the small town of Dove Creek, Montana. After examining accounting records for the past several years, he found that the store has been grossing ...
Monday, November 21, 2016 by Amy

Statistics
The life span of a calculator manufactured by the Intel Corporation has a normal distribution with a mean of 54 months and a standard deviation of 8 months. The company guarantees that any calculator that starts malfunctioning within 36 months of the purchase will be replaced ...
Monday, November 21, 2016 by Scarlett Garcia

statistics
To observe the effect of increasing sensitivity, assume a blood sugar screening level of 130 mg percent, with a sensitivity of 44.3% and a specificity of 99.0%. Set up a two by two table with the appropriate numbers in each cell. Calculate the following values when the number ...
Monday, November 21, 2016 by jessy

mathematical methods for economics
in a class of 300 students,they were given mathematics test in three subjects namely,economics,statistics and mathematics,90 students failed in economics,100 failed in statistics,96 failed in mathematics,60 failed in economics and statistics,64 failed in statistics and ...
Monday, November 21, 2016 by sonu

Statistics
The heights of women in a certain population have a Normal distribution with mean 64 inches and standard deviation 3.5 inches. We select three women at random from this population. Assume that their heights are independent. Find the probability that the tallest of these three ...
Sunday, November 20, 2016 by Sarah

Statistics
What is the average miles per gallon (mpg) for all new cars? Using Consumer Reports, a random sample of 35 new cars gave an average of 21.1 mpg. (a) Identify the variable. new cars total miles all cars miles per gallon (b) Is the variable quantitative or qualitative? ...
Sunday, November 20, 2016 by Amy

statistics and probabilities
Suppose you will be taking exams in English, statistics and chemistry tomorrow and from past experience you know that for each exam you have a 50% chance of receiving an A. List all the possibilities for receiving A's on various exams. Letting X represents the number of A's ...
Saturday, November 19, 2016 by rhinechilde

Statistics
Sorry but I don't know how to do this problem. Can someone please help me? In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Ocean fishing for ...
Saturday, November 19, 2016 by Tina

staistics
7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
Saturday, November 19, 2016 by Eli

Stats
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle 40% ...
Friday, November 18, 2016 by Mark

Math
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle 40% ...
Friday, November 18, 2016 by Alex

Math
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle 40% ...
Friday, November 18, 2016 by Alex

AP Statistics - Chapter 6
A quiz consists of 20 multiple-choice questions, each with 6 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 50 %. P(pass)=
Friday, November 18, 2016 by Robert Stewart

Statistics
Please help, I do not understand how to do this: Let x be a random variable that represents white blood cell count per cubic milliliter of whole blood. Assume that x has a distribution that is approximately normal, with mean μ = 7400 and estimated standard deviation σ = 2900...
Thursday, November 17, 2016 by Amy

Statistics
Suppose the heights of 18-year-old men are approximately normally distributed, with mean 66 inches and standard deviation 4 inches. (a) What is the probability that an 18-year-old man selected at random is between 65 and 67 inches tall? (Round your answer to four decimal ...
Thursday, November 17, 2016 by Amy

Statistics
In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Ocean fishing for billfish is very popular in the Cozumel region of Mexico. In the Cozumel region ...
Thursday, November 17, 2016 by Amy

English 10
A Contribution to Statistics" 1.Which of the following words best describes the author's view of humanity in "A Contribution to Statistics"? A. Altruistic B. Optimistic*** C. Pessimistic D. Realistic Read the following lines from the poem "A Contribution to Statistics." Glad ...
Thursday, November 17, 2016 by Ashley

Statistics
Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of watch lifetimes is 7 ...
Wednesday, November 16, 2016 by Amy

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Homework Help: Math