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1. Explain why a 95% confidence interval estimate for the mean value of y at a particular x is narrower than a 95% confidence interval
1. Explain why a 95% confidence interval estimate for the mean value of y at a particular x is narrower than a 95% confidence interval for an individual y value at the same value of x.
2. You are given the following information from fitting a multiple regression with three variables to 30 sample data points:
????1=1.3
????2=10.0
????3=25.2
????????1=0.3
????????2=2.0
????????3=15.0
Test the following Hypotheses, Use alpha = .05:
- a) Beta1=0
b) Beta2=0
c) Beta3=0
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