1. Use the information given to calculate the standard error of the mean. Mean systolic blood pressure for a sample of n=324 men is =123.5, and the standard deviation is s=9.
2. If each of the following is decreased but everything else remains the same, will a confidence interval become wider, will it become narrower, or will the width remain the same? Explain?
a.) The sample estimate
b.) The standard error
c.) The confidence interval