help with the following questions:

(a) A test preparation company wants evidence that their course improves students' scores on the ACT exam. From a random sample of 40 students who took the course, they do a paired t test to compare the students' scores on the ACF exam before the course with their scores after the course (subtracting in the order (after - before)). The test has a test statistic oft = 1.95; what is the Pvalue of the test? Round to 3 decimal places. p = (b) A company that manufactures X-ray machines wishes to estimate the proportion of their machines that malfunction and produce excess radiation. A random sample of 56 of the machines is taken and 11 of the machines malfunction. Find a 90% condence interval for the true proportion of the company's machines that malfunction. Round to 3 decimal places. C1=( I ) (c) A researcher is interested in the effects of screentime on sleep. She wants to estimate the average number of hours of screentime that college students get between 9 pm and when they go to sleep. A random sample of 28 college students has an average amount of screentime after 9 pm of 1.6 hours with a standard deviation of 0.9 hours. Calculate a 95% condence interval for the average amount of screentime that college students get between 9 pm and when they go to sleep. Round to 3 decimal places. CI = ( , )