A business school claims that students who complete a 3-monthtyping course can type a mean of more than 1200 words an hour. Arandom sample of 25 students who completed this course typed a meanof 1125 words an hour, with a standard deviation of 85 words.Assume that typing speeds for all students who complete this coursehave an approximately normal distribution. A) Using the P-Valuemethod and a significance level of 1%, is there evidence to supportthe business school’s claim? B) Construct the correspondingconfidence interval and explain how it supports your conclusion in(a).
