L2 - Repeated T-Test

Question 1

Who developed the T-test

Answer 1

Sealy Gosset (1908) at a Guinness Brewery

Question 2

What were the t-tests created for?

Answer 2

Small sample sizes

Question 3

What is the purpose of a T-Test?

Answer 3

Used to compare the average values of two related groups + to see if there is a significant difference between these two groups

Question 4

What are the 3 types of t-test?

Answer 4

One sample t-test
Independent samples t-test
Paired samples t-test

Question 5

What is a one sample t-test?

Answer 5

Compares a group to a known value

Question 6

What’s a independent samples t-test?

Answer 6

Compares 2 different groups

Question 7

What’s a paired samples design?

Answer 7

Compares related/matched paired groups

Question 8

What is a t-stat?

Answer 8

used in a t-test to determine whether to support or reject the null hypothesis

Question 9

What are the assumptions for paired samples t-test/

Answer 9

*DV must be continuous.
*IV should have two related/matched groups.
*Differences between pairs should be normally distributed.
*No significant outliers in differences between groups.

Question 10

How do you calculate the a paired samples t-test?

Answer 10

1.Calculate sum of differences (Σd).
2.Calculate sum of squared differences.
3.Multiply sum of squared differences by number of pairs.
4.Square the sum of differences.
5.Calculate degrees of freedom (df = n - 1).
6.Subtract squared sum of differences from sum of squared differences.
7.Divide result by degrees of freedom.
8.Square root the result.
9.Divide sum of differences by the square root result.