Intensities have been measured for eight flashlights. Find the appropriate t value from the t table to

Question:

Intensities have been measured for eight flashlights. Find the appropriate t value from the t table to use for each of the following confidence interval calculations:
a. Two-sided 95% confidence.
b. Two-sided 99% confidence.
c. Two-sided 99.9% confidence.
d. Two-sided 90% confidence.