The Data
Detergent 1 | Detergent 2 | Detergent 3 |
84 | 78 | 87 |
79 | 74 | 80 |
87 | 81 | 91 |
85 | 86 | 77 |
94 | 86 | 78 |
89 | 89 | 79 |
89 | 69 | 77 |
83 | 79 | 78 |
The tests
Method
Null hypothesis All variances are equal
Alternative hypothesis At least one variance is
different
Significance level α = 0.05
95% Bonferroni Confidence Intervals for Standard Deviations
Sample N StDev CI
Detergent 1 8 4.55914 (2.24810, 13.1943)
Detergent 2 8 6.71353 (3.48027,
18.4809)
Detergent 3 8 5.22186 (1.40284,
27.7382)
Individual confidence level = 98.3333%
Tests
Method Test Statistic P-Value
Multiple comparisons — 0.566
Levene 0.64 0.537
Note: Used Minitab for calcutation
For #8 on page 469, put the data in Excel with the correct format for ANOVA....
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