What is the equivalent expression for( 7 x 6+7 x y)
1 answer:
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Answer:
The 98% confidence interval for the mean repair cost for the dryers is (83.4161, 103.3039).
Step-by-step explanation:
We have a small sample size n = 25, and s = 19.95. The confidence interval is given by
where
is the
th quantile of the t distribution with n - 1 = 25 - 1 = 24 degrees of freedom. As we want the 98% confidence interval, we have that
and the confidence interval is
where
is the 1st quantile of the t distribution with 24 df, i.e.,
. Then, we have
and the 98% confidence interval is given by (83.4161, 103.3039).