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. -2.8571Â Â Â Â Â Â Â b.-2.8427
c. -2.8866 Â Â Â Â Â Â 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.
