A sample of 9 production managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000. what sample size would be needed to ensure that we could estimate the true mean salary of all production managers with more than 15 years experience within $4200 if we wish to be 95% confident?

Q: Humerus bones from the same species of animal have approximately the same length-to-width ratios. It…

A: Solution: Given information: n= 100 Sample size  x= 5.6 Sample mean s= 0.25 Sample standard…

Q: If a population has a standard deviation σ of 36 units, what is the standard error of the mean if…

A: The population standard deviation is 36.

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A: The mean is 500 and the standard deviation is 100.

Q: If a sample has a mean of 150 and a standard deviation of 9, what is the value in the data set that…

A: Given,mean(μ)=150standard deviation(σ)=9Z-score=1.58

Q: 2. The average time spent sleeping (in hours) for a group of medical residents at a hospital can be…

A: Given that  X~N(μ= 6.1 , σ= 1) μ= 6.1 , σ= 1 Formula for Z-score Z=(X-μ)/σ

Q: 3. A research reported that undergraduate students have a mean credit card balance of $3,173. This…

A: Here use both way of hypothesis testing

Q: Ten years ago, the mean age of death row inmates was 44.9 according to the US Dept.of Justice. A…

A: The provided data is,

Q: According to a recent survey, the population distribution of number of years of  education for…

A: What is the standard error of mean?

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Solution

Q: umerus bones from the same species of animal have approximately the same length-to-width ratios. It…

A:

Q: Suppose​ 18% of​ movie-goers say that horror is their favorite movie genre. If a random sample of…

A: Obtain the mean number of movie-goers that prefer horror movie genre. The mean number of movie-goers…

Q: Do the data support your claim at the 1% level?

A: The summary of the statistics is, The type of test is right tailed test

Q: If gasoline in a certain part of the country has a mean price of $1.62 per gallon and a standard…

A: From the given information, Mean = $1.62 gallon Standard deviation =8 cents =$0.08 gallon (since 100…

Q: State the null and alternative hypotheses. Using α = 0.01 level of significance, what is your…

A: 1. Let μ denotes the mean credit card balance for undergraduate students. The claim of the test is…

Q: In a study entitled How Undergraduate Students Use Credit Cards, it was reported that undergraduate…

A: Given that, sample size n=100 sample mean credit card balance x¯=3506 Population standard deviation…

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A:

Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: Let Population 1 be the salaries for people with doctoral degrees and Population 2 be the salaries…

Q: The test statistic is The p-value is Should the null hypothesis be rejected?

A: here from given information  for gamer in age- group 16-25 x1¯ = 42.5 σ1 = 9.5 n1 = 351    for gamer…

Q: Suppose that Sacramento workers have a mean commute of 17 minutes and commute times are normally…

A:

Q: An economist would like to estimate the mean amount of money that a family spends to within $45. If…

A: GivenMargin of Error(E)-45standard deviation(σ)=190α=1-0.93=0.07α2=0.035zα2=1.8119      (from z…

Q: The honors program at Brads University only except students with an entrance score exam over 400.…

A:

Q: A paper describes asrvey ofasample of e maie students and a sampie of 5 female students ata large…

A:

Q: According to the Bureau of Labor Statistics, the mean salary for registered nurses in Kentucky was…

A: Central Limit Theorem for mean: If a random sample of size n is taken from a population having mean…

Q: Suppose the mean height of women age 20 years or older in a certain country is 62.7 inches. One…

A: We have given that The null and alternative hypothesis are H0 : µ = 62.7Ha : µ ≠ 62.7 The test…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 454 and a standard…

A:

Q: Suppose that another sample of resting heart rates for five Math students was obtained: 72, 68, 66,…

A: From the given data we want to know the data value .

Q: Find a 90% interval estimate of the mean daily time spent on rigorous exercise by all employees.

A: From a random sample of 25 employees, the mean time spent on vigorous daily exercise was 28.5…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Given data,n1=40x1=46.6σ1=4.6n2=45x2=48.8σ2=2.4Compute value of test statistic?

Q: Suppose exam scores in a statistics class are normally distributed with a mean of 89 and standard…

A: Given data, Mean=89 sd=8 P(X<x)=0.45 x=?

Q: Suppose the mean height of women age 20 years or older in a certain country is 62.7 inches. One…

A: The claim is that the mean heigh of women in the city differs from the national mean.

Q: survey of 2,250 adults reported that 55% watch news videos. Complete parts (a) through (c) below.…

A:

Q: Suppose a claim is made that the mean age of members of a golf club is 52 years. The population…

A: Given: μ = 52 σ = 6 n = 50 X = 56 Formula Used: Test-statistic Z = X-μσn

Q: An article in the San Jose Mercury Newsstated that students in the California state university…

A:

Q: Suppose a small paint manufacturing company has a daily production that is normally distributed with…

A:

Q: . Average annual expense of a middle-income household living in Afghanistan is 360,000 Afghani with…

A: Given, Mean μ = 360000Standard deviation σ = 4000sample size n = 1500

Q: Suppose the scores of students on an exam are normally distributed with a mean of 558 and a standard…

A:

Q: An economist would like to estimate the mean amount of money that a family spends to within $36. If…

A: Given that  Population standard deviation =200 Margin of error =E =36 91% confidence.

Q: The standard IQ test has a mean of 99, and a standard deviation of 16. We want to be 90% certain…

A: Given data,μ=99σ=16E=5Z-value at 90% Confidence is Zc=1.645n=?

Q: If this​ 3-year-old boy grows up to be a man with a height at the same​ percentile, what will his…

A: The population mean is 70 and population standard deviation is 3.

Q: Compute standard deviation for the following data : 5, 8, 7, 11, 9, 10, 8, 2, 4, 6.

A:

Q: A researcher would like to estimate the mean amount of money that a family spends to within $75. If…

A: Determine the sample size.   The sample size is obtained below as follows: