Testing for differences between unrelated samples

Question 1

What does unrelated samples mean?

Answer 1

No relationship between the two data sets e.g. frog weights from two separate ponds

Question 2

What is the parametric test for unrelated samples?

Answer 2

T-test

Question 3

What is the non-parametric test for unrelated samples?

Answer 3

Wilcoxon rank-sum test/ Mann Whitney U test

Question 4

If you use unrelated ordinal data, which test is best to use?

Answer 4

Wilcoxon rank-sum - non parametric

Question 5

What do you report in your results when you have used a t-test?

Answer 5

t = …, df = (sample size -1) and P-value

Question 6

What is a significant result when using the T-test?

Answer 6

P < 0.05

Question 7

What descriptive statistics do we report with the t-test result?

Answer 7

Mean and Standard Deviation

Question 8

What result is significant if a Wilcoxon rank sum test was used?

Answer 8

P < 0.05

Question 9

When using a Wilcoxon rank sum test what do we report?

Answer 9

W value, P value and N in each sample (n1 = 30, n2 = 45)

Question 10

If you are testing for a difference then what sort of tail test should you use?

Answer 10

Two-tailed test