Question

What is the cut-off t-score for each of the following t-tests? Round your answers to two decimal places.

• A two-tailed t-test at the 5% significance level, df = 45
• A one-tailed t-test (high predicted) at the 1% significance level, df = 20
• A two-tailed t-test at the 1% significance level, df = 90

Answer 1

The answers can be easily obtained from students t table with value with .

1. 2.01

2. 2.53

3. 2.63

Explanations

1.

We have and two tailed test. So the value to be found is with

So we get the followig graph and the required answer as 2.014

2.

Similar to first we want to find with as we have one tailed test.

So the required answer is2.528

3. Here we have two tailed test. So the answer will be 2.632