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A. Suppose we test the proportions of people who like having a cup of coffee early...

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Statistics

A. Suppose we test the proportions of people who like having acup of coffee early in the morning for two populations:H0 : p1=p2 vs Ha :p1< p2. The samplesizes for these two population are n1=n2=400 and the numbers of people wholike coffee are x1 =160 andx2=200 respectively. What is the valueof the test statistics?

a. -2.8571        b.-2.8427

c. -2.8866        d. -2.8284

B. Suppose we take Type I error level to be α = 0.01 in theabove population proportion testing. What is your conclusion?

a. Reject H0.   b. Accept H0 c. Do not know.

Answer & Explanation Solved by verified expert
3.6 Ratings (558 Votes)
For sample 1 we have that the sample size is N1 400 thenumber of favorable cases is X1 160 so then the sampleproportion is For sample 2 we have that the sample size is N2 400 thenumber of favorable cases is X2 200 so then the    See Answer
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