Assume that a sample is used to estimate a population mean ? .Find the margin of error M.E. that corresponds to a sample of size18 with a mean of 47.4 and a standard deviation of 16.9 at aconfidence level of 90%. Report ME accurate to one decimal placebecause the sample statistics are presented with this accuracy.M.E. _________
he effectiveness of a blood-pressure drug is being investigated.An experimenter finds that, on average, the reduction in systolicblood pressure is 32.7 for a sample of size 288 and standarddeviation 11.5.
Estimate how much the drug will lower a typical patient's systolicblood pressure (using a 80% confidence level).
Enter your answer as a tri-linear inequality accurate to onedecimal place (because the sample statistics are reported accurateto one decimal place).
______< ?< ______
SAT scores are distributed with a mean of 1,500 and a standarddeviation of 300. You are interested in estimating the average SATscore of first year students at your college. If you would like tolimit the margin of error of your 95% confidence interval to 25points, how many students should you sample?
Make sure to give a whole number answer.
