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Upright vacuum cleaners have either a hard body type or a soft body type. Shown are the weights in pounds of a random sample of
Upright vacuum cleaners have either a hard body type or a soft body type. Shown are the weights in pounds of a random sample of each type. A reviewer wishes to see if the mean weights of the two types are different. Hard body types
20 | 17 | 18 | 19 | 16 | 17 | 15 | 21 | 24 |
15 | 18 | 18 | 12 | 14 | 17 | 17 | 18 |
Soft body types
23 | 12 | 12 | 12 | 12 | 14 |
Find the 95% confidence interval for the difference of the means.
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