Answer:
c. 2.063899
Step-by-step explanation:
Assuming a confidence interval bilateral.
For this case the confidence is 95% so then the significance level is:
And
The degrees of freedom are given
So then we need to find a quantile on the t distribution with 24 degrees of freedom that accumulates 0.025 of the area on each tail, and we can use the following excel code:
"=T.INV(1-0.025,24)"
Or equivalently "=T.INV.2T(0.05,24)"
And we got
So the best option is:
c. 2.063899