A nationwide clothing store has found that the average customer wait time to get checked out is 9 minutes with a population standard deviation of 2 minutes. A branch manager has hired more personnel in order to reduce the amount of customer wait time. He takes a random sample of 50 customers and finds that the average wait time is 8 minutes.   Calculate the test statistic. (Round your answer to two decimal places.)     Based on  ? = 0.01,  what is the correct conclusion for the hypothesis test?

Q: A professors exam scores have been consistent for years and normally distributed. The whole data…

A: From the provided information, Sample size (n) = 80 Population standard deviation (σ) = 1.75 Sample…

Q: Apple claims that the iPad has very good battery life. Albert collected a simple random sample of 30…

A: Given n=30

Q: The mean annual premium for automobile insurance in the United States is $1503 (Insure.com website,…

A: Given:The provided sample mean is  = 1440 and the Sample standard deviation is s = 165, and the…

Q: Perform the appropriate test of hypothesis to determine whether the new bulb should be used. Use a…

A: It is given that Sample size n = 40 Sample mean M = 505 Sample SD s = 18 Level of significance =…

Q: Starting engineers in the Philippines earned an average annual salary of P282,000. For that same…

A:

Q: A professors exam scores have been consistent for years and normally distributed. The whole data…

A: From the provided information, Population mean (µ) = 25.4 Population standard deviation (σ) = 1.75…

Q: Prior to the virus outbreak in Maine, a one-pound box of pasta cost $1.09 cents. You sample 24…

A: The sample mean is to be tested here for before and after. Sample mean before = $1.09 Sample mean…

Q: a. Enter the null hypothesis for this test. Ho Select an answer ? b. Enter the alternative…

A: It is given that  Population mean, μ = 14.1 Sample mean, X̄ = 14.5 Sample standard deviation, s =…

Q: An article in a local town newspaper discusses the results of state test scores in their town. The…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: The University bookstore claims that the mean textbook cost is $100. A group of students claim that…

A: Given,sample size(n)=20sample mean(x¯)=$104sample standard deviation(s)=$15population…

Q: A newspaper in a large Midwestern city reported that the National Association of Realtors said that…

A: Givensample size(n)=63Mean(x)=118900standard deviation(σ)=3700significance level(α)=0.05

Q: A pipes manufacturer makes pipes with a length that is supposed to be 18 inches. A quality control…

A: Hypothesized population mean μ0=18 Sample size n=25 Sample mean x=18.07 Sample standard deviation…

Q: The mean number of eggs per person eaten in the United States is 272. Do college students eat more…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: exie gets 2.3 likes per day, on average, on a Facebook ad she pays for, with a standard deviation of…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: What would be your decision concerning the null hypothesis?

A: Consider that the population mean oxygen uptake of healthy women is denoted by .Hypothesized value…

Q: A sports analytics firm would like to test whether Kyrie Irving’s points per game is different from…

A: Given n=19, x=22.9, s=9.5, μ=25.2,α=0.05

Q: Bojangles advertises that their chicken biscuit weighs 153 grams. Some MVHS students, meet every…

A:

Q: researcher is interested in the average body temperature of people. We all assume that the average…

A: We all assume that the average body temperature is 98.6°F with a standard deviation of 1.2°F. The…

Q: A company claims that each bag of pretzels weighs 11.3 oz. A sample of 37 bags was weighed. The mean…

A: Given that Sample size =37 Sample mean =11.05 Population mean=11.3 Sample standard deviation =1.35…

Q: To test whether or not there is a significant difference in the average snowfall in Maryland, and…

A: The provided sample means are shown below: Xˉ1=5.4\bar X_1 = 5.4 Xˉ2=5.2\bar X_2 = 5.2 Also, the…

Q: determine if the typical weight loss is different than 10 pounds.

A: Given that  A new weight-watching company advertises that those who join will lose, on the average,…

Q: A newspaper in a large Midwestern city reported that the National Association of Realtors said that…

A: Solution: Given information: n= 63 Sample size x= $118900  Sample mean μ= $116800  Population…

Q: The average time it takes for a person to experience relief from aspirin is 25 minutes. A new…

A: 1. Null Hypothesis: H0: The mean amount of time relief will be felt is not less than 25 minutes.…

Q: Starting engineers in the Philippines earned an average annual salary of P282,000. For the same…

A: GivenMean(x)=408000standard deviation(s)=274342sample size(n)=24α=0.1

Q: engineers in the Philippines

A:

Q: In the past, the average teaching evaluation score in an economics department has been 3.95. The…

A:

Q: The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is…

A: The single mean t-test is used to compare the mean of a variable in a sample of data to  mean in the…

Q: A researcher is interested in seeing if the average income of rural families is less than that of…

A: From the given information, the claim of the test is the average income of rural families is less…

Q: The average age of commercial jets in the U.S. is 15.6 years. An executive at a large airline…

A: Since you have posted question with multiple subparts,we will solve first three subparts for you.To…

Q: Scores on a large standardized test are normally distributed with a national average score of 75. At…

A: Given Information :  Scores on a large standardized test are normally distributed with a national…

Q: The article referenced says that when women aged 25-34 binge drink they have on average 6.7 drinks.…

A:

Q: A study claims that all adults spend an average of 17 hours or more on chores during a weekend. A…

A: x̄ be the sample mean  n be the sample size  σ be the population standard deviation  Population mean…

Q: Your local newspaper contains a large number of advertisements for unfurnished one-bedroo apartments…

A: The question is about hypothesis testing.Given :Randomly selected no. of apartments ( n ) = 36Sample…

Q: cans purchased from a nationally known manufacture is actually 1 gallon. You know from the…

A: Answer:- Given, mean, µ = 1 gallon  Standard deviation, σ = 0.02 gallon Sample size, n = 50 cans…

Q: Zappos is an online retailer based in Nevada and employs 1,300 employees. One of their competitors,…

A: It is given that Sample size is n = 22 Sample mean M = 33.9 Sample SD s = 4.1 Levem of significance…

Q: A factory that manufactures screws is performing a quality control experiment. Each object should…

A: Null and alternative hypotheses: The hypothesis, which is pre assumed as true, tentatively settled…

Q: A study by a corporation revealed that the mean weekly salary for managers in department A was…

A: From the provided information,

Q: A pipes manufacturer makes pipes with a length that is supposed to be 10 inches. A quality control…

A: The sample size is 39, sample mean is 10.05, sample standard deviation is 0.28. It is clear that the…

Q: manufacturer of banana chips would like to know whether its bag filling machine works correctly at…

A:

Q: When you purchased your car, the dealer told you that your average gas mileage on your car was…

A:

Q: A tire producer wants to test whether the mean diameter of the tires produced on a given day equals…

A: Given random sample,n=49 x=36.4 and σ=0.8 inches alpha level =0.05 Here tire producer wants to…

Q: The mean length of lumber is supposed to be 8.5 feet. A builder wants to check whether the shipment…

A: In this scenario, a builder wants to verify whether a shipment of lumber she receives has the…

Q: Fred and Martina, senior agents at an airline security checkpoint, carry out advanced screening…

A: Step 1: Denote μ1, μ2 as the population mean processing times for Fred and Martina, respectively.

Q: Results from a civil servant exam are shown in the table to the right. Is there sufficient evidence…

A: Correct hypotheses is  (B)   The chi-square statistic is 2.4668.