Essay
In a simple linear regression based on 30 observations,the following information is provided: = 32.3 + 1.45x and se = 3.2.Also,
evaluated at x = 20 is 1.3.
a.Construct a 95% confidence interval for E(y)if x = 20.
b.Construct a 95% prediction interval for y if x = 20.
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