The human resources department of a large investment bank announced that the number of people it interviews monthly has a mean of 115, with a standard deviation of 15.7. The management of the bank suspects that the standard deviation exceeds 15.7. Suppose that the management wants to take a small sample of months and carry out a hypothesis test to see if its suspicions have support. State the null hypothesis and the alternative hypothesis that it would use for this test.

Every hypothesis test requires the analyst to state a null hypothesis and an alternative hypothesis. ... Often, researchers choose significance levels equal to 0.01, 0.05, or 0.10; but any value between 0 and 1 can be used. Test ... As part of the analysis, you may need to compute the standard deviation or standard error of the ...