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Question: Consider the following null and alternative hypotheses:
H0: μ = 60 versus H1: μ > 60
Suppose you perform this test at α = .01 and fail to reject the null hypothesis. Would you state that the difference between the hypothesized value of the population mean and the observed value of the sample mean is "statistically significant" or would you state that this difference is "statistically not significant"? Explain.
The average drying time of a manufacturer's paint is 20 minutes. Investigating the effectiveness of a modification in the chemical composition of her paint, the manufacturer wants to test the null hypothesis μ = 20 minutes against a suitable alte..
Alcohol abuse. Growing concern about binge drinking among college students has prompted one large state university to conduct a survey to assess the size.
The publisher selects a random sample of 200 subscribers and finds that 116 plan to renew their subscriptions. Use (a=0.01). p = the population of subscribers to Golf Illustrated who renew. Calculate the p-value.
why is it so important to periodically take a physical inventory when using a perpetual inventory system? does the
It seems that simulation could handle any situation or study. But is that always true? Discuss instances in which a simulation would be important and useful, and then a situation in which a simulation would not be appropriate.
Approval rating. A newspaper reports that the governor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults
Did scores change significantly for the group that drank caffeine? Test an appropriate hypothesis and state your conclusion.
The experiment data in below table was to evaluate the effects of three variables on invoice errors for a company. Invoice errors had been a major contributor to lengthening the time that customers took to pay their invoices and increasing the acc..
Compute the mean, standard deviation, median, and standard error for each group.
The service manager of Appliance Universe has recorded the times for a simple random sample of 50 refrigerator service calls taken from last year's service records. The sample mean and standard deviation were 25 minutes and 10 minutes, respectivel..
A microwave oven repairer says that the mean repair cost for damaged microwave oven is less than $90. You work for the repairer and want to test this claim.
One car is selected at random from the cars with vehicle tags from these cities. What is the probability that this car is from Salem?
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