20. Given: n = 80, X =76.5, s=3.1. Which of these is the point estimate of the population mean? A. 80 B . 76.6 C. 8.9 D. 3.1 For nos. 21 -26 The mean gasoline consumption of 10 cars is 28 liters with a standard deviation of 1.6 liters. Find the point and the interval estimates using 95% confidence level. 21. What is a ? A. 95% B . 28 C. 1.6 D. 0.05 22. What is the point of estimation ? A. 95% B . 28 C. V10 D. 1.6 23. What is the appropriate distribution? A. Z B . t C. P D. S 24. What are the confidence coefficients? A. + 1.96 B. + 2.26 C. +2.33 D. + 2.58 25. The lower limits is approximately. A. 27 B . 26.85 C. 26.81 D. 26.68 26. The upper limits is: A R 2915 2919 79 37