Weights of Vacuum Cleaners 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. Find the 95% confidence interval for the difference of the means. Assume the variables are normally distributed and the variances are
unequal. Round the sample mean and sample standard deviation to two decimal places and the final answers to at least one decimal place.
21
15
23
16
Hard body types
16 17 20
20
16
17
18
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13 15
|
17 11 13 12
Soft body types
24 17 18 13
Use μ, for the mean weight of the hard body type.
X
3
