A random sample of size 15 is selected from a normal populat

A random sample of size 15 is selected from a normal population. The population standard deviation is unknown. Assume the null hypothesis indicates a two-tailed test and the researcher decided to use the 0.10 significance level. For what values of t will the null hypothesis not be rejected?

Solution

if t value lies in the range of ( - 1.7613, 1.7613) then null hypothsis cannot be rejected

http://www.danielsoper.com/statcalc3/calc.aspx?id=10

here df = 14 and prob = 0.10