L6: Parametric Tests Part 1

Question 1

What test do we use to compare two paired groups with continuous, normally distributed data?

Answer 1

Paired-samples t test

Question 2

What is the null and alternative hypothesis for paired samples t test?

Answer 2

H0: The mean difference between x and y = 0
H1: e.g. the mean difference between x and y not equal to zero

Question 3

What are the assumptions for the paired samples t test?

Answer 3

• population of differences in values for each pair is normally distributed

Question 4

What test do we use to compare data for two independent groups with continuous, normally distributed data?

Answer 4

Independent samples t test

Question 5

What are the assumptions for independent samples t test?

Answer 5

• two underlying populations are normally distributed
• two underlying populations have equal variances –> if not significantly diff, use independent samples t test for equal variances. if significantly diff, use independent samples t test for unequal variances.
• use F test or Levene’s test to test for equality of variances

Question 6

What is the null and alternative hypotheses for independent samples t test?

Answer 6

H0: There is no difference between the mean ____ of the two groups.
H1: There is a difference between the mean _____ of the two groups.