In an aerospace industry some companies allow their employees to accumulate extra working hours to be 50 hours a week on an average .One of such company analyst wanted to test that whether the average working hours of accumulation are changes or remains the same after selecting the sample of 20 managers with sample mean as 13.56 hours and sample standard deviation as 7.8 hours at 5% level of significance. Apply suitable method for the same and what is its significance.

Q: The average baptismal cost includes 50 guests. A random sample of 32 baptismal during the past year…

A: Given n=32 x¯=53s=10α=0.05

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.21 and a…

A: X~N( μ , ?)   μ=8.21 , ?=1.48   Z-score =( x - μ )/?

Q: Regular employee in IBM receives an average of M=40.5 emails per day. This situation causes…

A: Z_test: If the given sample size is more than 30 or Population standard deviation is given. then…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and a…

A: Consider,X be a random variable that represents the shoe size of American women that has a…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.9…

A: Givenn=31x=12.2σ=1.9α=0.10

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Given ,  Population mean = μ = 13 years Population standard deviation = σ = 1.8 years Sample size =…

Q: he president of a university believes the entering class this year has an average ACT score…

A: This is the right tailed test .

Q: Explain, the significance level that you accept this sample taken from a student population with an…

A: Here Use t test of single sample Mean Because population standard deviation unknown  P value from t…

Q: Markus is not as smart as his friends in class so he wants to take private lessons to his friends as…

A: Given : we will calculate the standard deviation of the data  sample size, n = 8 Sum, Σx = 88 Mean,…

Q: Suppose that shoe sizes of american women have a bell shaped distribution with a mean of 8.42 and a…

A:

Q: Activity trackers are electronic devices that people wear to record physical activity. Researchers…

A: Given Information:  Sample size (n) = 61  Mean value (x) = 9797 steps Standard deviation = 2313…

Q: Justin started working on the sales force of ECE Calls Inc. On average, she closes the contract if…

A:

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.478.47…

A: The random variable shoe size follows normal distribution. The population mean is 8.47. The…

Q: A local grocery store manager was tracking the amount of water customers purchased during the…

A: Consider that μ defines the population mean amount of water purchased by Americans.

Q: The variability of oil prices per barrel has been very stable for the past 26 weeks.  You would like…

A: State the hypotheses. That is, there is no evidence that the gas prices variability has changed.…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given,mean(μ)=53standard deviation(σ)=5Empirical rules:1) P(μ-σ<X<μ+σ)=68%2)…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 2…

A: The hypotheses for the test is given below.Null hypothesis:H0: µ = 13Alternative hypothesis:H1: µ ≠…

Q: In a recent year, the Federal Communications Commission reported that the mean wait for repairs for…

A: GivenMean(x)=22.3standard deviation(σ)=8.3sample size(n)=100

Q: The Environmental Protection Agency, EPA in 2016, issued guidelines stating that Perfluorooctanoic…

A: From the provided information, Sample size (n) = 49 Sample mean (x̄) = 592 Sample standard deviation…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.338.33…

A: Given: Mean,  μ = 8.33 Standard deviation, σ = 1.48 Concept: The empirical rule states that:…

Q: A sample of 27 account balances of credit company showed a mean of customer balance of 6,000, but…

A: Given data : sample size, n = 27 sample mean, x̄ = 6000.0 sample standard…

Q: 3. Consumer Reports indicated that the mean braking distance (from 60 miles per hour) on wet…

A: GivenMean(x)=150standard deviation(s)=26.5sample size(n)=45significance level(α)=0.05

Q: An energy company changed its billing method in a small town claiming that the change would decrease…

A: Hypothesis: The null and alternative hypotheses are below: H0: μ=225H1: μ<225 The test statistic…

Q: You are the manager of a restaurant for a fast-food franchise. Last month, the mean waiting time at…

A:

Q: ppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.42 and a…

A: Given data,Mean μ=8.42sd    σ=1.52P(6.9<X<9.94)=?

Q: Suppose that in the past years the average price per square foot for warehouses in Subic has been…

A: Given: μ=32.28σ=1.29x¯=31.67n=19α=0.05

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.358.35…

A: The provided information are: Population mean (µ) = 8.35 Population standard deviation (σ) = 1.46

Q: e used to patients after minor surgeries. 40 patients with minor surge ever and found an average of…

A: Suppose the sample xi, (i=1,2,...,n1) of size n1 has been drawn from the population with mean μ1 and…

Q: It is desired to determine whether there is a less variability in the mutriation in the health…

A: An F-test for equality of variances is a hypothesis test that is used to assess whether two…

Q: A coin operated drink machine was designed to discharge a mean of 9 ounces of coffee per cup. In a…

A: we have given that  sample size (n)=17   , sample mean =9.19  , and standard deviation (s)=0.28

Q: A coin operated drink machine was designed to discharge a mean of 8 ounces of coffee per cup. In a…

A: The random variable discharge follows normal distribution. We have to test whether the true mean…

Q: Using the empirical rule, what percentage of American women have shoe sizes that are no more than…

A: It is given that Mean, μ = 8.33Standard deviation, σ = 1.5

Q: In a study, two groups of students were considered and their scores were recorded. Use a 0.05…

A: Given Data : For Sample 1 x̄1 = 78.4 s1 = 12.87 n1 = 40 For Sample 2…

Q: Are severe psychiatric disorders related to biological factors that can be physically observed? One…

A: Solution: Given information: n1=10 Sample size of patients with obsessivecompulsive disordersn2=10…

Q: Average SHS annual cost of tuition fee for all private school last year was 46,300. A random sample…

A: The provided information are: Sample size(n) =45Sample meanx¯=47800Sample standard deviation(s)=5600

Q: A hospital administrator noticed a large change in the weight of babies being born at the hospital…

A: Given,sample size(n)=10sample mean(x¯)=7.07population standard…

Q: A coin operated drink machine was designed to discharge a mean of 8 ounces of coffee per cup. In a…

A: Given,   Sample size = 19 Sample mean = 7.9 Sample standard deviation = 0.17

Q: The mean length of a work week for the population of workers was reported to be 45 hours. Suppose…

A: Note:Hey, since there multiple questions  posted, we will answer first question for you. If you want…

Q: Suppose that grade point averages of undergraduate students at one university have a bell-shaped…

A: Empirical rule: The probability that the observation under the normal curve lies within 1 standard…

Q: A local grocery store manager was tracking the amount of water customers purchased during the…

A: Consider that μ defines the population mean amount of water purchased by Americans.

Q: A survey was conducted to determine the average number of hours that people spend on the internet…

A: GivenMean(x)=3standard deviation(s)=1sample size(n)=100significance level(α)=0.05

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.168.16…

A: Given : population mean, u = 81.6  population standard deviation,σ = 1.52

Q: Is narcissism a more common personality trait today than it was a few decades ago?  It is known that…

A: From the provided information, Sample size (n) = 25 Mean (M) = 16.5 Sample standard deviation (s) =…

Q: (a) What are the null hypothesis H, and the alternative hypothesis H, that the managers should use…

A: Dear students as per the guidelines we solve only first three subparts only multiple parts are…

Q: A manufacturing facility has been set up so that the distribution of the actual weight of potato…

A: Given: μ = 16 σ = 0.45 X = 17.1 Formula  Used: Z-score = X-μσ