Many companies allow managers to accumulate extra working hours above 40 hrs/week (called comp time). Suppose a VP wants to estimate the avg amount of comp time accumulated per week for all managers in her company. The VP selects a random sample of 18 managers. If the sample reveals an average comp time of 13.56 hrs/week, with a standard deviation of 7.8 hrs, construct a 90% confidence interval to estimate the avg amount of comp time accumulated per week in the company.

Q: A sociologist found that in a sample of 49 retired police officers, the average number of jobs they…

A: sample size(n)=49 Mean(x)=7.2 standard deviation(s)=2.1 confidence level=99%

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: 4. Felician University uses hundreds of fluorescent light bulbs each year. The brand of bulb it…

A: The mean lifetime of current brand that it uses is of 900 hours. The mean and standard deviation of…

Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if the…

A:

Q: The XYZ business school has undergraduate programs at its Korea Campus. Courses are the same as are…

A: Given that  Number of students = 55 mean score = 83 standard deviation of score = 7.2  Fairfax…

Q: Find the critical t value to use in making a 99% confidence interval for a mean if the sample size…

A: Solution-: Given: n=7,α=0.01 We find the critical t- value to use in making a 99% C.I. for a mean

Q: Dana is a math professor who usually teaches in-person but has recently started teaching online.…

A: Given that, mean , μ=76.5standard deviation,σ=19.1and sample mean(class-average),x =68.4 and sample…

Q: The average weight of 36 randomly selected school buses was 4150 pounds with a standard deviation of…

A: Given data,x=4150σ=480n=36z-value at 99% confidence is Zc=2.576

Q: In a survey, 45 people were asked how much they spent on their last partners birthday gift. The…

A: Given information- Sample size, n = 45 Significance level, α = 0.10 Sample mean, x-bar = $90 Sample…

Q: Suppose a new Director of Health Services for a district claims that she will reduce the average…

A: The one sample t-test is performed in MINITAB for the given data.Step-by-step procedure to perform…

Q: Find the critical t value to use in making a 98% confidence interval for a mean if the sample size…

A:

Q: Dr. Vegapunk thinks that watching anime (Japanese animated shows) decreases social skills in college…

A: Dr. Vegapunk thinks that watching anime (Japanese animated shows) decreases social skills in college…

Q: A random sample of 40 Americans yielded a sample mean of 67 gallons of carbonated beverages per…

A: We have given that,  Sample mean (x̄) = 67, Population standard deviation (σ) = 22 and sample size…

Q: We are trying to test whether, a new low fat diet actually helps obese people lose weight. 150…

A: Solution: Hypothesis testing:   From the above hypothesis test we can conclude that the low fat…

Q: The distribution of study times for first-year students follows a normal distribution with a…

A:

Q: A study of 64 bolts of carpet showed that their average length was 75 yards. The standard deviation…

A:

Q: A runner wants to know her average mile running time. She records a sample of 25 running times. The…

A: Solution: Let X be the mile running time. From the given information, x-bar=6.5 minutes, s=0.7…

Q: In a certain university, a student can qualify for a masteral degree program in Business…

A: Given info: The test scores is normally distributed with mean of 175 and standard deviation of 20.

Q: random sample of 15 students was selected from a population size of 100 (normal) in a certain…

A:

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 from random sample of 500 teenagers, the mean number of sweaters owned was 12.5 and a…

A:

Q: Suppose that you want to decide which of the two equally priced brands of light bulbs last longer.…

A: Given: n1 = 100 X1 = 1175 Hours S1 = 105 Hours n2 = 100 X2 = 1220 Hours S2 = 80 Hours Significance…

Q: A study regarding the gender socialization of children growing up in nontraditional families…

A: Hypothesis test is consists of two statements. They are null and alternate hypothesis. Null…

Q: Suppose you compared 2 independent samples. The first sample contained 10 people, had a mean score…

A: Given that,mean(x)=37.6standard deviation , s.d1=1.5number(n1)=10mean(y)=34.2standard deviation,…

Q: Suppose that, in 1995, the weight of 16-year old males in the United States was normally distributed…

A: Thank you for posting this question ! You have correctly chosen that a z test needs to be performed…

Q: An engineer would like to design a parking garage in the most cost-effective manner. He reads that…

A: Given information Hypothesized mean µ = 76.4 inches Sample size (n) = 100 Mean x̅ = 77.1 inches…

Q: A pharmaceutical company needs to know if its new cholesterol drug, Praxor, is effective at lowering…

A: a)To testH0:μ1=μ2H1:μ1<μ2       It is given that n1=39x1=19.8s1=2.1n2=46x2=18.4s2=2.8

Q: In a random sample of six mobile​ devices, the mean repair cost was ​$65.00 and the standard…

A:

Q: sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56…

A: Given:  Sample size n=37  Sample mean(xbar) x¯ =2.56  Standard deviation( ?)=0.09  To find 95%…

Q: A study of 81 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: An organizational psychologist conducted a study to see whether upgrading a company's older computer…

A: Given Mu=120 Standard deviations=20 n=45

Q: After post-graduate study, Mike found a job as HR analyst in London. The company is currently…

A:

Q: A pharmaceutical company needs to know if its new cholesterol drug, Praxor, is effective at lowering…

A: Given Data : For treatment group x̄1 = 23.2 s1 = 4.4 n1 = 38 For…

Q: A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose…

A: Given, As per z-distribution table, the critical value of z at 0.05 level of significance is…

Q: A random of 15 freshmen takers obtained a mean score of 74 and a variance of 9 on a SASE. Assuming…

A: Given,sample size(n)=15standard deviation(s)=9=3degrees of…

Q: A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: A new drug is being tested to see if it reduces the frequency of migraines.  Study participants were…

A: Solution

Q: Find the 90% confidence interval for the variance and standard deviation of the ages of students at…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by: