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Two rival manufacturers of penlight batteries claimed that their product lasts longer than the other. Thirty samples of Brand A and thirty-four of Brand B were tested. The following are the lengths of lives of such batteries recorded in hours. Use . Brand A 38 41 42 36 39 41 43 35 36 38 42 39 40 43 44 35 40 39 37 40 42 44 38 37 41 40 38 42 45 41 Brand B 38 40 41 43 39 41 40 43 39 38 40 43 44 39 40 41 42 39 40 45 40 38 42 41 40 36 37 41 42 40 36 38 41 40

Two rival manufacturers of penlight batteries claimed that their product lasts longer than the other. Thirty samples of Brand A and thirty-four of Brand B were tested. The following are the lengths of lives of such batteries recorded in hours. Use . Brand A 38 41 42 36 39 41 43 35 36 38 42 39 40 43 44 35 40 39 37 40 42 44 38 37 41 40 38 42 45 41 Brand B 38 40 41 43 39 41 40 43 39 38 40 43 44 39 40 41 42 39 40 45 40 38 42 41 40 36 37 41 42 40 36 38 41 40

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Two rival manufacturers of penlight batteries claimed that their product lasts longer than the other. Thirty samples of Brand A and thirty-four of Brand B were tested. The following are the lengths of lives of such batteries recorded in hours. Use .

Brand A
38
41
42
36
39
41
43
35
36
38
42
39
40
43
44

35
40
39
37
40
42
44
38
37
41
40
38
42
45
41


Brand B
38
40
41
43
39
41
40
43
39
38
40
43
44
39
40
41
42

39
40
45
40
38
42
41
40
36
37
41
42
40
36
38
41
40


A teacher wants to find out if there is a significant difference in the academic performance of two groups of students. One group meets thrice a week while the other meets twice a week. Below are the final exam scores of the two groups. Use .

3x/wk
80
85
74
75
65
66
80
77
75
95
66
55
79
85

2x/wk
66
98
87
84
85
56
59
25
53
45
66
52

 

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