If two samples each with n 15 are being used to estimate th

If two samples, each with n = 15, are being used to estimate the mean difference between their two population, what values of t would be used to construct a 90% confidence interval?

a. +/- 1.311

b. +/- 1.699

c. +/- 1.313

d.+/- 1.701

Solution

For 90% confidence interval, t value can be found out from t table

Df = 15-1 =14

t critical = 1.701

Hence d is the right option