Question

13. Find the mean of the data: 5, 6, 8, 11, 15 C) 11.2 B) 56 D) 15 E) None of the Above A) 9 14. Here are the commutes for a group of 6 employees of a business in which 53 employees commute. Find the standard deviation. 156 130 54 57 140 151 A) 46.71 B) 52.06 C) 49.29 D) 36.79 E) None of the Above 15. Use the given sample data: construct a 95% confidence interval for the population mean: n = 13, xbar = 14.2, A) (11.91, 16.49) B) (12.87, 15.54) C) (12.57, 15.83) D) (13.03, 15.37) E) None of the Above 16. The principal randomly selected 6 students to take an aptitude test. Their scores were: 91.5, 80.5, 74.0, 76.7,7 and 77.1 Determine a 90% confidence interval for the mean score for all students. A) (74.23, 84.57) B) (65.90, 89.57) C) (70.19, 85.28) D) (71.82, 83.65) E) None of the Above 17. Find the Range of the data: 3,5,9, 21, 47, 53, 54, 56 A) 35 B) 14 C) 21 D) 53 E) None of the Above

Answer 1

mcan 5, 6, 8, 11, 15 { xi ia 5 5+6+ 8 + 11 +15 x 5 45 . 9 A S 4 T = 156+130+ S4+57 +140+ 151 1708-5 156 6 136 688 6 114.66 23.80.34 (x - ū) 156-114.6) ² (1 20-114.6674235.13 (54-114-66) (57-174.60)43325036 (140-114.6014641.8) (151-114.60321320.11 S4 57 140 IS 10911-33 Total = Standard deviation ut I & (21-7² S 1=1 10911.33 6 42.64 (None of the above)

། - 14.2 n = 13 contidence interval for given by меаи IN I but here is not given so, it not be calculated by given information. can Za N = 1.96, = 14-2, vñs vs = 3.6 gl.s, 80.5 74.0, 76.7, 7 and 77.1 90% confidence interval T I Zan 406.8 G 67.8 2012 Z -1/2 1.64 ㅗ 6-1 { (aina2 30.40 Vo = 2-44 6 7.8 + 1.64 12.45 47:38 88.218)

(17)

Range =Maximum - Minimum

=56-3

53 (Option D)