Deck 16: Is There a Relationship Between Two Variables Spearmans Correlation

Question 1

Spearman's r is the non-parametric equivalent of which non-parametric test?

A) One-way ANOVA
B) Pearson's r
C) Independent t test
D) Repeated t test

Answer 1

B
Explanation: See summary of parametric tests and their non-parametric equivalents on p216

Question 2

Spearman's r cannot be calculated if…

A) You have no tied ranks
B) You have tied ranks
C) You expect to find a negative correlation
D) You expect to find a positive correlation

Answer 2

B

Question 3

If you have tied ranks when calculating a Spearman's r, how would you analyse your dataset?

A) Run Pearson's r on the ranked data
B) Run Pearson's r on the raw data
C) Run Spearman's r on the ranked data
D) Run Spearman's r on the raw data

Answer 3

A
Explanation: If there are tied ranks you should treat the ranked scores as your raw data and calculate a Pearson's correlation

Question 4

When you rank the data in a Spearman's r, you should…

A) Rank the difference scores
B) Rank the raw scores from variable X only
C) Rank each variable separately
D) Rank all data, regardless of variable

Question 5

When calculating a Spearman's r, what does ∑d² calculate?

A) The sum of the squared difference ranks
B) The sum of the difference scores, which is then squared
C) The sum of scores in condition d
D) The sum of scores in condition 2

Question 6

When calculating a Spearman's r, how do you calculate the df?

A) N - 1
B) N -2
C) N
D) N*2

Question 7

You are calculating a Spearman's r and you have 15 participants. What are the degrees of freedom?

A) 16
B) 15
C) 14
D) 13

Question 8

You are calculating a Spearman's r with df = 9 and a two tailed test with an alpha level of .050. What is the critical value?

A) .648
B) .618
C) .536
D) .709

Question 9

You are calculating a Spearman's r with a calculated value of .898, df = 6 and a two tailed test. What is the smallest value at which this critical value is significant?

A) .050
B) .020
C) .010
D) .001

Question 10

What is wrong with this reporting of a Spearman's r? r_s (12) = .724, p .050

A) There is no symbol between the p and the p value
B) The p value is in the wrong place
C) The df are in the wrong place
D) The calculated value is in the wrong place

Question 11

In the belief in the paranormal example, what are the X and Y ranked scored for the first participant?

A) Xr = 7, Yr = 6
B) Xr = 6, Yr = 7
C) Xr = 24, Yr = 6
D) Xr = 6, Yr = 24

Question 12

In the belief in the paranormal example, what is ∑d²?

A) 0
B) 1
C) 7
D) 6

Question 13

In the belief in the paranormal example, when calculating the statistic, what is the calculated sum on the lower part of the division within the equation?

A) 7
B) 36
C) 336
D) 343

Question 14

In the belief in the paranormal example, what is the calculated r_s value?

A) .738
B) 6
C) .050
D) .8929

Question 15

In the belief in the paranormal example, what type of relationship has been found?

A) A not significant positive correlation
B) A not significant negative correlation
C) A significant positive correlation
D) A significant negative correlation