Question: The US Mint selects ten pennies from the production line to test the hypothesis that the mean weight of each penny is 4 grams. The normally-distributed weights (in grams) of these pennies are as follows: 7, 6, 1, 6, 7, 8, 8, 9, 10, 7. Assume a= 0.05.

??State the null and alternate hypotheses
?Calculate the sample mean and standard deviation
??Determine which test statistic is appropriate (z or t), and calculate its value.
??Determine the critical value(s).
?State your decision: Should the null hypothesis be rejected?