For many years, working full-time has meant working 40 hours per week. Nowadays, it seems that corporate employers expect their employees to work more than this amount. A researcher decides to investigate this hypothesis. 0: The average time full-time corporate employees work per week is 40 hours.
: The average time full-time corporate employees work per week is more than 40 hours.
To substantiate his claim, the researcher randomly selects 250 corporate employees and finds that they work an average of 47 hours per week with a standard deviation of 3.2 hours.

In order to assess the evidence, we need to ask: