The T test

Question 1

Describe the T distribution

Answer 1

• Similar in shape to the normal distribution

- Indexed by the number of observations minus one

Question 2

What is a T-test used for?

Answer 2

Measuring discrepancies between the Null hypothesis and the data estimate

Question 3

What does the value of the T-test tell us ?

Answer 3

How much the data estimate strays from the truth given the assumptions of the Null hypothesis

Question 4

What is the p-value?

Answer 4

The probability of observing the T-test value given the assumptions of the Null hypothesis

• P-value high –> fail to reject Ho
• P-value small–> reject Ho

Question 5

What is the hypothesis t-test value given by?

Answer 5

The estimate minus the hypothesised value all divided by the standard error