How do we compute DF and T-critical (Exampe #2) first, following, critical, equation

invic

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

Bad5shah

CPK
Can you please compute DF from the data given above?
thanks

cfalevel2011

they should’ve given you the number of sample points… haven’t they?
in the absence of that - you cannot do this ….

genuinecfa

man - it gives you df=40 on the question… at least when I look at the question online

Kapie

also the online version says 98% confidence interval (df=40).
possibly an update of QBank is called for.

ayodayo

I use the qbank, but not the online qbank. I use the qbank that is downloaded to the hard-drive.
On my question, the df is not given :-(