In 2010, adults in the United States weighted an average of 168 pounds. In 2012, a researcher in a sample of 200 adults finds an average weight of 182 with a standard deviation of 3 pounds. (1) State...

In 2010, adults in the United States weighted an average of 168 pounds.  In 2012, a researcher in a sample of 200 adults finds an average weight of 182 with a standard deviation of 3 pounds. (1) State the null and alternative hypotheses for this study (2) What is the dependent and independent variable for this study (3) What test statistic/hypothesis test would you select to determine if the means are significantly difference at the alpha .01 level? (4) What critical value would you use to make your decision to reject or retain the null hypothesis at alpha .01?