7. Say we want to test whether the population mean is less than 100, and the sample we take yields a sample mean of 90. Is this sufficient evidence that the population mean is less than 100? Explain why or why not. (p. 492)
9.1.7
No. It depends on how many standard deviations the sample mean of 90 is below the population mean of 100 and the level of significance of the test.