1. The mean time a customer waits in line before checking in a grocery chain is less than 10 minutes. To verify the performance of the store, the obtaining mean time of 25 customers is 9.5 minutes with a standard deviation of 1.6 minutes. Use these data to test the null hypothesis that the mean time is 10 minutes, at a 0.01 level of significance.

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: what is the z-score of a value of 32 of a set A, given that the set has a mean of 24 and a standard…

A: The answer is found in step-2

Q: 4. Suppose that in the past years the average price per square foot for warehouses in Subic has been…

A: One sample t-test: The one -sample t -test is used to determine whether the mean of sample differs…

Q: 6. A research article reported that for a random sample of 850 meal purchases made at fast food…

A: We have to perform left tailed test for the difference in means and since sample size is large…

Q: 1) The average salary for public school teachers for a specific year was reported to be $39385. A…

A: Given that : Sample size (n) = 50  Population mean (mu) =  $ 39385 Sample mean = $ 41680 Sigma =…

Q: The mean lifetime of 200 mobile phones in a sample is 1,000 hours and their standard deviation is…

A: Given : N=200 ,   df=(n-1)=200-1 =199 Sample mean =1000 Standard deviation =130 We have to check…

Q: Is it reasonable to consider that the 100 scores obtained from that region from population that…

A:

Q: 2. Given a standard deviation of 3.7, what is the mean if1 0% of the population has a distribution…

A: We have given that,  Let x be the random variable from normal distribution with standard deviation…

Q: 9. The Taylor Steel Company wants to determine whether there is a significant difference in…

A: Solution: Given information: n1= 130 Sample size of day shiftn2= 120 Sample size of night shiftx1=…

Q: 2. A researcher is interested in the decrease in adolescent BMI after a new after school program is…

A: Sample size: Sample is the part of the population that will help us to draw the inference about the…

Q: Suppose, according to a 1990 demographic report, the average U. S. household spends $90 per day.…

A:

Q: Suppose that 100,000 recent grads have starting salaries which are normally distributed with a mean…

A: Given that  μ=120,000σ=20,000 b) Consider the probability that the salary above $131,200 is,…

Q: 4. A researcher claims that the standard deviation of the numberof deaths annually from typhoons in…

A:

Q: 4-A health maintenance organization (HMO) wants to estimate the mean length of a hospital stay. How…

A: The random variable length of a hospital stay follows normal distribution. The margin of error is…

Q: 1. Suppose that we want to estimate to within $1000 the mean salary of all graduates who were…

A: Given,margin of error(E)=1000standard deviation(σ)=5000α=1-0.95=0.05α2=0.025z0.025=1.96

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A:

Q: 4. In studying ocean conditions, the Bureau of Fisheries found that for one location, the August…

A: Given ,Mean μ = 83.6Standard deviation σ=24Let  x be temperature normally distributed

Q: A.  A beverage bottling company labels a product as having a mean volume of 16 oz.  It is important…

A: A. The beverage bottling company labels a product as having a mean volume of 16 oz.

Q: A researcher is interested in the decrease in adolescent BMI after a new after school program is…

A:

Q: 4. A recent study stated that if a person smoked, the average of the number of cigarettes he or she…

A: Given that  Hypothesized Population Mean (\mu)(μ) = 1414 Population Standard Deviation…

Q: The manufacturer of a certain brand of auto batteries claims that the mean life of these batteries…

A: Given, x=46.05n=25σ=5.1α=0.025 The hypothesis to be tested here is: H0:μ=50H1:μ<50 This is a left…

Q: 1- Applying for a specific job requires obtaining the mark of 500 in the contest exam. If 16 persons…

A:

Q: Suppose that employees at a large company have salaries that are normally distributed, with a mean…

A: We have given that, Let X be a random variable i.e. salaries of employees are normally distributed…

Q: A marketing researcher wants to estimate the mean amount spent per year ($) on a web site by…

A: Given values, n=100x¯=60s=55

Q: The Orange County Supervisor claims that full-time salaried employees in her county have a mean…

A: Given:

Q: To evaluate the effect of a treatment, a sample is obtained from a population with a mean of μ = 30,…

A: (a) State the hypotheses. Thus, the value of the test statistic is 1.73                 Use EXCEL…

Q: 2. A company which produces batteries claims that the life expectancy of their batteries is 90…

A:

Q: The 2008 General Social Survey asked a large number of people how much time they spent watching TV…

A: According to the given question, The 2008 General Social Survey asked a large number of people how…

Q: Is there any systematic tendency for part-time college faculty to hold their students to different…

A: Given, We assume 1 as fulltime faculty; We assume 2 as part timers; Significance level,

Q: 12. The manager of a fast-food restaurant wants to be sure that, on average, customers are served…

A: From the provided information, Sample size (n) = 41 Sample mean (x̅) = 3.75 Standard deviation (s) =…

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A:

Q: The 2019 General Social Survey asked a number of teenagers from different countries how much time…

A: To check if there is a larger variety of TV watching times for teenagers in the United States is…

Q: 2. A scrap metal dealer claims that the mean of his cash sales is "no more than $80," but an…

A: Given that: Population mean(u) = $ 80 Sample mean = $ 91 SAMPLE standard deviation = $21 Sample size…

Q: Suppose that the annual household income in a small Midwestern community is normally distributed…

A: Solution: Let X be the annual household income in a small Midwestern community is normally…

Q: A national business magazine reports that the mean age of retirement for women executives is 61.7. A…

A:

Q: 2. A university dean wishes to estimate the average number of hours his part-time instructors teach…

A:

Q: 1. The average height of all previous contestants in a beauty pageant has been 180 cm with a…

A: The given mean for all previous contestants is 180 cm and standard deviation is 5 cm. That is,…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: a) Given claim is the mean tenure for a chief executive office was at at least nine years. Null…

Q: # 6- A set of data items is normally distributed with a mean of 90 and a standard deviation of 5.…

A:

Q: 2. The owner of a factory that sells a particular bottled fruit juice claims that the average…

A: Given: population mean(μ)=250sample size(n)=100sample mean (x¯)=248standard deviation(σ)=5

Q: 2) A job placement director claims that the average starting salary for nurse is $26000. A sample of…

A:

Q: Is there any systematic tendency for part-time college faculty to hold their students to different…

A: Given : n1=125  x1=2.7386  S1=0.63342 n2=88 x2=2.8639 S2=0.50241 We have to calculate t stastics and…

Q: The lecturer are concerned that students who enrolled for the course this semester are spending more…

A: From the given information, H0: The mean is at least 6 hours. H1: The mean is less than 6 hours.…

Q: A researcher hypothesizes that the average number of sports that a college offers for males is…

A:

Q: 4. A normally distributed set of 1,010 values has a mean of 103 and a standard deviation of 12.…

A:

Q: Suppose the average wait time at a local Urgent Care facility is 5 min with a standard deviation of…

A:

Q: 1.) It is claimed that the average performance of newly graduated nurses from the recent board exam…

A: Since you have asked multiple question, we will solve the first question for you. If youwant any…