1- Claim: The mean pulse rate(in beats perminute) of adult males is equal to 69 bpm. For a random sample of 142 adultmales, the mean pulse rate is 70.2 bpm and the standard deviation is 10.6 bpm. Find the value of the test statistic.

2- Claim: Fewer than 92% of adults have a cell phone. In a reputable poll of 1227 adults, 83% said that they have a cell phone. Find the value of the test statistic.

3-Determine the margin of error for a confidence interval to estimate the population mean with =24 and s= 11.8 for the confidence level below. Assume the population is normally distributed.

The margin of error for a 90% confidence interval is