Big babies: The National Health Statistics Reports described a study in which a sample of 315 one-year-old baby boys were weighed. Their mean weight was 25.6 pounds with standard deviation 5.3 pounds. A pediatrician claims that the mean weight of oneyearold boys is greater than 25 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the ct : 0.05 level of significance and the Pvalue method with the TI84 Plus calculator. (b) Compute the value of the test statistic. Round the answer to two decimal places. _ X 5 Confidence in banks: A poll conducted asked a random sample of 1276 adults in the United States how much confidence they had in banks and other nancial institutions. A total of 150 adults said that they had a great deal of confidence. An economist claims that less than 14% of U.S. adults have a great deal of confidence in banks. Can you conclude that the economist's claim is true? Use both (X : 0.01 and a: 0.05 levels of signicance and the P-Value method with the T184 Plus calculator. (b) Compute the value of the test statistic. Round the answer to at least two decimal places. PM a X b