In Exercise 9.24, a fast-food chain compared two ways of promoting a turkey burger. In a separate experiment with 10 pairs of stores, the difference in the month’s increased sales between the store that used coupons and the store with the outside poster had a mean of $3000. Does this indicate a true difference between mean sales for the two advertising approaches? Answer by using the output shown to test that the population mean difference is 0, carrying out the five steps of a significance test. Make a decision using a 0.05 significance level.
Answer to relevant QuestionsRefer to the previous exercise. a. Explain how the result of the 95% confidence interval shown in the table agrees with the test decision using the 0.05 significance level. b. Suppose you instead wanted to perform a ...In the experiment in Example 4, we got a P-value = 0.000 for testing H0: p = 1/7 about dogs’ ability to diagnose urine from bladder cancer patients. a. For the significance level 0.05, what decision would you make? b. If ...A study plans to have a sample of obese adults follow a proposed low-carbohydrate diet for three months. The diet imposes limited eating of starches (such as bread and pasta) and sweets, but otherwise no limit on calorie ...a. An advertisement by Schering Corp. in 1999 for the allergy drug Claritin mentioned that in a clinical trial, the proportion who showed symptoms of nervousness was not significantly greater for patients taking Claritin ...A person who claims to possess extrasensory perception (ESP) says she can guess more often than not the outcome of a flip of a balanced coin. Out of 20 flips, she guesses correctly 12 times. Would you conclude that she truly ...
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