Example 3 in this section illustrated the procedure for finding a prediction interval for an individual value
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Example 3 in this section illustrated the procedure for finding a prediction interval for an individual value of y. When using a specific value x0 for predicting the mean of all values of y, the confidence interval is as follows:
where
The critical value t?/2 is found with n - 2 degrees of freedom. Use the pizza subway data from the Chapter Problem to find a 95% confidence interval estimate of the mean subway fare given that the price of a slice of pizza is $2.25.
Transcribed Image Text:
ŷ - E < < + E ŷ E = ta/2° n + n(x0 - 7) n(Σx3) – (Σx)2
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