In each of the following exercises, formulate an appropriatenull hypothesis and perform a test of that null hypothesis at the5% and 1% signiï¬cance levels. Use a one-sided or two-sided test asappropriate.
10. An instructor administers a 2-minute sit-up test to a classof 10 students, obtaining the following scores.
X : 55,45,48,62,58,60,42,44,53,55
The instructor expects students to have an average score of no morethan 45 on the sit-up test. Part (a) Assume that 10 is the standarddeviation of the sit-up test scores of all the coach’s past andpresent players.
