We want to conduct a hypothesis test of the claim that the population mean score on a nationwide examination in biology is different from 494. So, we choose a random sample of exam scores. The sample mean of 508 and a standard deviation of 77. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answer to 2 decimal places.

a). The sample has a size of 75, and is from a non normally distributed population with a known standard deviation of 78.

z=

t=

It is unclear which test statistic to use