Can someone help on these

Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 8 1 0 3 21 Female 2 1 8 1 1 31 Total 10 28 14 52 Let p represent the population proportion of all female students who received a grade of B on this test. Use a 90% confidence interval to estimate p to four decimal places if possible. : (pc The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 13.4 for a sample of size 29 and standard deviation 11.7. Estimate hovvr much the drug will lower a typical patient's systolic blood pressure [using a 80% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places. |