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three measurements are taken on each person (skin, thigh, arm) in an attempt to obtain variables useful in predicting their body fat (also measured)

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three measurements are taken on each person (skin, thigh, arm) in an attempt to obtain variables useful in predicting their body fat (also measured). Output of SAS regression of fat on skin, thigh, and arm variables and regression of fat on skin are given on the following pages.

1. Given a formula(s) to construct a confidence interval for 0+501+202+303. Make it clear that you could calculate the lower and upper bounds if asked. Include the Student's t value for a 95% confidence level.

2. The regression coefficient associated with skin differs in the full and simple linear regression models. Explain the difference.

3. There are 10 confidence intervals in the middle of page D. What confidence level can be associated with the claim that all 10 are correct inferences?