For the confidence intervals of Exercise 14, a histogram of the data looks like this:
Check the assumptions and conditions for your inference.
Answer to relevant QuestionsThe owner of the store from Exercise wants to know if the mean age of all customers is 25 years old. a) What is the null hypothesis? b) Is the alternative one- or two-sided? c) What is the value of the test statistic? d) ...Using the t-tables, software, or a calculator, estimate: a) The critical value oft for a 90% confidence interval with df = 17. b) The critical value oft for a 98% confidence interval with df = 88. A company is interested in estimating the costs of lunch in their cafeteria. After surveying employees, the staff calculated that a 95% confidence interval for the mean amount of money spent for lunch over a period of six ...Suppose the state in Exercise 35 sampled 16 small retailers instead of 51, and for the sample of 16, the sample mean increase again equaled $ 2350 in additional sales tax revenue collected per retailer compared to the ...The speed-measuring machines must measure accurately to maximize effectiveness in slowing traffic. The accuracy of the machines will be tested before placement on city streets. To ensure that error rates are estimated ...
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