A designer of a certain type of race cars asserts that painting a car increases its...

A designer of a certain type of race cars asserts that painting a car increases its top speed by reducing drag. To test this, the top speeds (in mph) of six cars were measured on a track before and after painting. The results are shown in the table below. Test the claim that the mean of the differences (painted – not painted) for all race cars (paired T-test) is positive at the 95% confidence level. Do these results support the designer’s assertion?

Unpainted	214	208	198	216	208	213
Painted	216	206	201	218	208	215

Solutions

Expert Solution

Let us denote the difference

d = painted – not painted

There is not sufficient evidence to support the designer’s assertion that the mean of the differences (painted – not painted) for all race cars (paired T-test) is positive.

orchestra answered 1 year ago

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