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A firm must decide between two different suppliers of lightbulbs. Management has decided to order from supplier A unless it can be proven that the mean lifetime of lightbulbs from supplier Bis superior. A test of 28 lightbulbs from A and 32 lightbulbs from B yielded the following data as to the number of hours of use given by each lightbulb: a 121 76 88 103 96 89 100 112 | 105 101 | 92 98 87 75 111 118 |118 121 96 93 82 105 78 84 96 103 119 85 84 b 127 133 87 | 91 81 122 |115 | 107 | 109 89 82 90 |81 |104 | 109 | 110 106 85 93 90 100 122 117| 109 98 94 103 107 101 99 112 90 Is there a significant difference between the two suppliers? Explain.

A firm must decide between two different suppliers of lightbulbs. Management has decided to order from supplier A unless it can be proven that the mean lifetime of lightbulbs from supplier Bis superior. A test of 28 lightbulbs from A and 32 lightbulbs from B yielded the following data as to the number of hours of use given by each lightbulb: a 121 76 88 103 96 89 100 112 | 105 101 | 92 98 87 75 111 118 |118 121 96 93 82 105 78 84 96 103 119 85 84 b 127 133 87 | 91 81 122 |115 | 107 | 109 89 82 90 |81 |104 | 109 | 110 106 85 93 90 100 122 117| 109 98 94 103 107 101 99 112 90 Is there a significant difference between the two suppliers? Explain.

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
Section10.3: Measures Of Spread
Problem 1GP
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A firm must decide between two different suppliers of lightbulbs. Management has decided to order from supplier A unless it can be proven that the mean lifetime of lightbulbs from supplier Bis superior. A test of 28 lightbulbs from A and 32 lightbulbs from B yielded the following data as to the number of hours of use given by each lightbulb: a 121 76 88 103 96 89 100 112 105 101 92 98 87 75 111 118 121 96 93 |82 105 78 84 96 103 119 85 84 b 127 133 87 91 81 122 115 | 107 109 89 82 90 81 104 | 109 110 106 85 93 90 100 122 117 109 98 94 103 107 101 99 112 90 Is there a significant difference between the two suppliers? Explain.
Transcribed Image Text:A firm must decide between two different suppliers of lightbulbs. Management has decided to order from supplier A unless it can be proven that the mean lifetime of lightbulbs from supplier Bis superior. A test of 28 lightbulbs from A and 32 lightbulbs from B yielded the following data as to the number of hours of use given by each lightbulb: a 121 76 88 103 96 89 100 112 105 101 92 98 87 75 111 118 121 96 93 |82 105 78 84 96 103 119 85 84 b 127 133 87 91 81 122 115 | 107 109 89 82 90 81 104 | 109 110 106 85 93 90 100 122 117 109 98 94 103 107 101 99 112 90 Is there a significant difference between the two suppliers? Explain.
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