Question 1

Which of the following is a two-group independent design?

Accepted Answer

A)  People with Migraine are measured on stress levels and frequency of migraine attacks
B)  A group of patients with Inflammatory Bowel Disease are tested both at baseline and after an intervention to improve their symptoms.
C)  People with Irritable Bowel Syndrome are compared with people with Inflammatory Bowel Disease on Cortisol levels.
D)  People with lower back pain are treated by weekly sessions of acupuncture for twelve weeks to determine if their back pain reduces C

Question 2

A researcher carries out a t-test to analyse the differences between two conditions.She wishes to use a one-tailed hypothesis.The output from SPSS gives a two-tailed probability of .10.Which value should she use to report the one-tailed associated probability?

Accepted Answer

A)  .010
B)  .50
C)  .05
D)  .10 C

Question 3

Which of the following shows whether scores from two independent groups have roughly equal variances?

Accepted Answer

A)  A t-test
B)  Levene's test
C)  The Mann-Whitney Test
D)  The Wilcoxon Test B

Question 4

Paired Samples Statistics
  Paired Samples Test
 
-Which is the correct answer?

Accepted Answer

A)  There is no significant difference in the participants as a result of the intervention
B)  There is a significant difference in the participants as a result of the intervention; symptoms have improved
C)  There is a significant difference in the participants as a result of the intervention; symptoms have become worse
D)  We cannot tell

Question 5

Which is the correct statement?

Accepted Answer

A)  The healthy group had a lower level of life satisfaction, Z= 2.70, p=.003
B)  The healthy group had a higher level of life satisfaction, Z=2.70, p=.003
C)  The healthy group had a lower level of life satisfaction, Z=2.70, p=.005
D)  The healthy group had a higher level of satisfaction, Z=2.70, =.003

Question 6

Which is the most appropriate answer? The Wilcoxon test is used for

Accepted Answer

A)  an independent design where scores are normally distributed
B)  a repeated-measures design where scores are normally distributed
C)  an independent design where scores are skewed
D)  a repeated measures design where scores are skewed

Question 7

If we say that the t-test is 'robust in respect of violations of the assumptions' we mean

Accepted Answer

A)  that the violation of assumptions does not make much difference to the results
B)  that the t-test is tough and strong
C)  that the violation of assumptions means that the assumptions are strong ones
D)  all of the above

Exam 6: Differences Between Two Groups