Question

7.1: Identify the critical t. An independent random sample is selected from an approximately normal population with unknown standard deviation. Find the degrees of freedom and the critical value t* when n 18 and the confidence level is 96% (please round to at least four places). - Degrees of freedom: Critical value:

Answer 1

Solution

Given that ,

n = 18

Degrees of freedom = n - 1 = 1 - 18 = 17

$\alpha$ = 1 - 0.96 = 0.04

$\alpha$ / 2 = 0.02

t _0.02,17 = 2.2238

Critical value of t ^*= 2.2238