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A simple random sample of 70 customers is taken from a customer information file and the...

  1. A simple random sample of 70 customers is taken from a customer information file and the average age is 36. The population standard deviation σ is unknown. Instead the sample standard deviation s is also calculated from the sample and is found to be 4.5. (6 points)
  1. Test the hypothesis that the population mean age is greater than 33 using

the critical value approach and a 0.05 level of significance.

  1. Test the hypothesis that the population mean age is less than 38 using the

p-value approach and a 0.05 level of significance.

  1. Test the hypothesis that the population mean age is different from 32

using the p-value approach and a 0.05 level of significance.

Math   Statistics-And-Probability   
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