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A business school claims that students who complete a 3-month typing course can type a mean...

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Basic Math

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).

Answer & Explanation Solved by verified expert
4.2 Ratings (591 Votes)
Part a H0 1200 versus Ha 1200 We are given 001 n 25 Xbar 1125 S 85 df n 1 24 Test statistic t Xbar Ssqrtn t 1125 1200 85sqrt25 t 44118 Pvalue 09999    See Answer
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