1) Poll done for Newsweek found that 13% of Americans have seen or sensed the presence of an angel. A contingent doubts that the percent is really that high. It conducts its own survey. Out of 100 Americans surveyed, only 3 had seen or sensed the presence of an angel. As a result of the contingent's survey, at a 5% level of significance, would you agree with the Newsweek poll?
In your answer, show your hypothesis your calculated z or t score and your decision to accept or not accept the null hypothesis
2) In a recent sample of 150 used cars sales costs, the sample mean was $6198 with a standard deviation of $2677. Assume the underlying distribution is approximately normal. Find the 98% confidence interval for the population mean.
Show your value for E , and your confidence interval