Four detergents' cleaning action were compared. Seventeen pieces of white cloth were first soiled with India ink. After washing the cloth pieces with four different detergents, the whiteness readings for the 17 pieces of cloth are shown below. Detergent C 73 78 A B 74 D 77 76 81 61 76 66 85 77 64 58 57 69

College Algebra (MindTap Course List)
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ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
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Chapter8: Sequences, Series, And Probability
Section8.7: Probability
Problem 6E: List the sample space of each experiment. Tossing three coins
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Four detergents' cleaning action were compared. Seventeen pieces of white cloth were first
soiled with India ink. After washing the cloth pieces with four different detergents, the
whiteness readings for the 17 pieces of cloth are shown below.
Detergent
A
B
C
D
77
74
73
76
81
66
78
85
61
58
57
77
76
69
64
69
63
Assuming all whiteness readings to be normally distributed with common variance, test the
hypothesis of no difference between the four brands' mean whiteness readings after washing.
Note: Do all calculation round off to two decimals.]
Transcribed Image Text:Four detergents' cleaning action were compared. Seventeen pieces of white cloth were first soiled with India ink. After washing the cloth pieces with four different detergents, the whiteness readings for the 17 pieces of cloth are shown below. Detergent A B C D 77 74 73 76 81 66 78 85 61 58 57 77 76 69 64 69 63 Assuming all whiteness readings to be normally distributed with common variance, test the hypothesis of no difference between the four brands' mean whiteness readings after washing. Note: Do all calculation round off to two decimals.]
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