Question

Find the reliability factor (critical value) based on the student t-distribution for a 90% confidence interval for a sample size of 4.

Answer 1

Degree of freedom = sample size -1 = 3

We will look in t distribution table for 90% and 3 degrees of freedom

Critical value = 2.353

Answer 2

SOLUTION :

Confidence interval = 90% .

So, two-tales area = 10% = 0.10 

Degree of freedom, dF = sample size - 1.

From t-table, critical value is : t = - 2.353  and + 2.353 (ANSWER).