RM - Year 2: Inferential Stats

Question 1

3 reasons for why a sign test may be used

Answer 1

• test of difference
• related design (matched pairs/repeated measures)
• nominal data (categorical)

Question 2

How do you calculate a sign test?

Answer 2

1. Increase (+), decrease (-) or no difference (=) in the conditions and data?
2. Add (+) together, then (-), the least frequent sign is the calculated value ((of S))
3. Calculate N by Number of participants minus any (=) identified in step 1, then find critical value by checking if the test is one-tailed or two-tailed, and degrees of freedom (usually 0.05)

Question 3

Which stat tests are tests of correlation?

Answer 3

• chi squared (nominal)
• spearman’s rho (ordinal)
• pearson’s r (interval)

Question 4

3 reasons for why chi-squared may be used

Answer 4

• nominal data
• test of difference AND correlation
• unrelated design

Question 5

How do you calculate the n value for Spearman’s rho?

Answer 5

N = number of ppts