How do we compute DF and T-critical (Exampe #2)
Wanda Brunner, CFA, is trying to calculate a 99% confidence interval for a regression equation based on the following information:
What are the lower and upper bounds for variable CS?
The coefficient for CS is .32
The standard error is .025
My first question is: How do we know it’s a two tailed test?
My second question is: How do we know what the DF are so we can compute T-critical?
This is what they give as the answer:
The critical t-value is 2.42 at the 99% confidence level (two tailed test). The estimated slope coefficient is 0.32 and the standard error is 0.025. The 99% confidence interval is 0.32 |
发表于 2013-4-16 15:06
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