1.You measure 38 watermelons' weights, and find they have a mean weight of 55 ounces. Assume the population standard deviation is 8.1 ounces. Based on this, construct a 99% confidence interval for the true population mean watermelon weight.
Give your answers as decimals, to two places _______ +/- ________
2. Assume that a sample is used to estimate a population mean μμ. Find the margin of error M.E. that corresponds to a sample of size 18 with a mean of 47.4 and a standard deviation of 16.9 at a confidence level of 90%.
Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. ME =___________
3.The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 32.7 for a sample of size 288 and standard deviation 11.5.
Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level).