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1. The following summary data was obtained for a study on fabric strength of two types of wool. Calculate the pooled variance and pooled standard deviation. Type size Mean S.D. 136.7 4.5 138.3 4.6 I 10 II 15

1. The following summary data was obtained for a study on fabric strength of two types of wool. Calculate the pooled variance and pooled standard deviation. Type size Mean S.D. 136.7 4.5 138.3 4.6 I 10 II 15

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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1. The following summary data was obtained for a study on fabric strength of two types of wool. Calculate the pooled variance and pooled standard deviation. Type size Mean S.D. I 10 136.7 4.5 II 15 138.3 | 4.6
Transcribed Image Text:1. The following summary data was obtained for a study on fabric strength of two types of wool. Calculate the pooled variance and pooled standard deviation. Type size Mean S.D. I 10 136.7 4.5 II 15 138.3 | 4.6
4. A company wished to study the effectiveness of a coffee break on productivity of its workers. The productiveness of nine randomly selected workers were measures on a day with no coffee break and a later on a day when the workers were given 10-minute coffee break. The scores measuring productivity are given below. Find the 98% confidence interval for the difference in productivity without and with a coffee break. Without break 23 35 29 33 43 32 28 38 41 38 40 43 37 39 With break 29 37 42 30
Transcribed Image Text:4. A company wished to study the effectiveness of a coffee break on productivity of its workers. The productiveness of nine randomly selected workers were measures on a day with no coffee break and a later on a day when the workers were given 10-minute coffee break. The scores measuring productivity are given below. Find the 98% confidence interval for the difference in productivity without and with a coffee break. Without break 23 35 29 33 43 32 28 38 41 38 40 43 37 39 With break 29 37 42 30
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