Answer the following: Statistica and Probability: Hypothesis Testing

Direction: Read the following questions carefully. Identify the appropriate sample size of each problem and choose the letter of your answer. Use z-table at the appendix as needed. Use a separate sheet of paper. 1. Which of the following is the appropriate sample size given a standard deviation of 6.4, confidence interval of p 98% and a margin of error or maximum allowable deviation of 2.35? a. 40 c. 42 b. 41 d. 43 2. Given: Margin of error (d)= 2.19, Confidence interval (CI) of population mean = 90%, and population standard deviation (o)= 5 solve for the appropriate sample size. a. 13 c. 15 b. 14 d. 16 3. Given: d= 3.92 CI- 94% 0= 7 n-? a. 25 c. 27 b. 26 d. 28 4. Given: d= 2.4 CI= 98% 0= 6.4 n=? a. 28 c. 30 b. 29 d. 31 5. To estimate the mean price of e-books of senior high schools, with a standard deviation of P80, how many e-books are needed to be selected as samples if we wanted to be 95% confident that the sample mean of e-books is within P20 of the true population a. 60 c. 62 b. 61 d. 63