1. Assume that a sample is used to estimate a population mean . Find the margin of error M.E. that corresponds to a sample of size 24 with a mean of 80.5 and a standard deviation of 7.5 at a confidence level of 99.9%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. =

2. The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 15.2 for a sample of size 421 and standard deviation 20.5. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 98% confidence level).Enter your answer as a tri-linear inequality accurate to one decimal place.

3. You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures:

31.4

32.3

54

51.9

38.3

53.7

33.4

29.8

49.6

42.4

55.7

Find the 98% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 98% C.I. =

4. If n=18, x(x-bar)=47, and s=4, find the margin of error at a 99% confidence level Give your answer to two decimal places.

5. Assume that a sample is used to estimate a population mean . Find the margin of error M.E. that corresponds to a sample of size 17 with a mean of 80.4 and a standard deviation of 15.6 at a confidence level of 98%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. =