Deck 19: Correlation

Question 1

1) Which of the following proposed relationships would be a negative correlation?

A) As IQ increases so does memory span
B) Reaction times are shorter the more caffeine participants are given
C) Extroversion scores are higher when self-esteem is greater
D) Longer television watching is related to more aggressive behaviour

Answer 1

B

Question 2

2) A researcher asks participants to run around a running track and then to take a sports events memory test. She records the position they came in the running and correlates these values with the scores obtained on the memory task, hypothesising that faster runners have better sports event memories.
What would be the appropriate test of correlation that she should use on her data?

A) Pearson's product moment correlation
B) Spearman's rank correlation
C) The point biserial correlation
D) The phi coefficient

Answer 2

B

Question 3

3) If a correlation of zero is found between two variables this could mean that:

A) There is a U shaped relationship between the variables
B) The scores on one variable are the same for every participant
C) There is no relationship between the variables
D) All of the above

Answer 3

D

Question 4

Consider the following data set gathered from 16 year olds where 'violent TV' is the number of hours of aggressive television the teenager reported viewing per week and 'aggression' is their score on an aggression scale where a high score indicates a high level of aggression.

-4) The Pearson correlation result is best reported as:

A) r = .805 with p < .05
B) r = .805 with p < .01
C) r = .681 with p < .05
D) r = .194 with p < .01

Question 5

Consider the following data set gathered from 16 year olds where 'violent TV' is the number of hours of aggressive television the teenager reported viewing per week and 'aggression' is their score on an aggression scale where a high score indicates a high level of aggression.

-5) The result above:

A) Shows that violent television viewing is a cause of aggression
B) Can be used to argue that aggressive teenagers choose to watch more violent television
C) Does not suggest a strong relationship between violent television viewing and aggression
D) Shows that violent television should be limited in teenage viewing

Question 6

Consider the following data set gathered from 16 year olds where 'violent TV' is the number of hours of aggressive television the teenager reported viewing per week and 'aggression' is their score on an aggression scale where a high score indicates a high level of aggression.
$$\begin{array} { | c | c | } \hline \text { Violent TV } & \text { Aggression } \\\hline 15 & 53 \\\hline 28 & 52 \\\hline 23 & 56 \\\hline 21 & 65 \\\hline 14 & 27 \\\hline 31 & 83 \\\hline 24 & 65 \\\hline 19 & 58 \\\hline 35 & 83 \\\hline\end{array}$$

-6) With the correlation data from above, with $\alpha$ at .05, would be about:

A) .62
B) 2.27
C) .805
D) .81

Question 7

7) Which of the following could not be a valid correlation coefficient?

A) .76
B) -.43
C) 0
D) 1.49