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A simple random sample of 80 customers is taken from a customer information file and the average age is 34. The population standard deviation σ is unknown. Instead the sample standard deviation s is also calculated from the sample and is found to be 5.5.
a. Test the hypothesis that the population mean age is greater than 30 using the critical value approach and a 0.05 level of significance.
b. Test the hypothesis that the population mean age is less than 37 using the p-value approach and a 0.05 level of significance.
c. Test the hypothesis that the population mean age is different from 31 using the p-value approach and a 0.05 level of significance.
in the test of a certain hypothesis the p-value corresponding to the test statistic is 0.0316. can the null hypothesis
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question five thousand randomly-selected mba graduates were surveyed to determine their future plans. the survey
MixedNutsis a store that sells a variety of unpackaged dried fruit and nut items. The current amounts of supplies of each item are listed in the following table:
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