Question

A researcher records the level of attention among 18 students during an interactive and lecture portion of a single class. If she computes a related samples t test at a 0.05 level of significance (two-tailed test), then what is the critical value for this test?

A) ±1.734
B) ±1.740
C) ±2.110
D) ±2.101

Answer 1

The answer is D) ±2.101

Explanation:

For a two-tailed test

n=18

a=0.05

a/2=0.05/2=0.025

1-a/2=1-0.025=0.975

From the t-distribution table, 0.975 along 18=2.101

Hence, the answer is ±2.101