Research Methods: Stats Testing

Question 1

This level of measurement is presented in the form of categories

Answer 1

Nominal

Question 2

This level of measurement can be ranked but does not have fixed intervals.

Answer 2

Ordinal

Question 3

A researcher gave a questionnaire to her participants to rate their happiness in their marriage on a scale of 1(unhappy) to 4 (happy). What level of measurement is she using and why?

Answer 3

Ordinal
It is based on opinions of whether they thought they have a happy marriage

Question 4

A researcher asked people whether they were currently on a diet or not on a diet. What level of measurement is this?

Answer 4

Nominal

Question 5

Why is time considered interval level data?

Answer 5

it is an objective/factual measure which has equal intervals

Question 6

A research gave participants a standardised IQ test. What level of measurement is this?

Answer 6

Interval (as it is a standardised measure)

Question 7

A researcher gave participants 20 words to learn. Group one listened to the words whereas the other group read the word. The total number correctly recalled was measured. What level of measurement is this?

Answer 7

Ordinal as there are not equal intervals between scores

Question 8

What examples of objective measures would be seen as interval level data?

Answer 8

Time, height, weight & standardised measures

Question 9

Which statistical test should be used?
The Bavarian Institute of Health Exploitation was concerned about the effect of lager drinking on the local population. They studied if there was a difference between drinkers and their IQ. The participants were grouped by IQ (high medium and low) and drinking (drinkers and non-drinker).

Answer 9

Chi-square
Difference - in IQ of drinkers and non-drinkers
Independent - either drinker or non drinker
Nominal - categories of high,medium or low IQ and drinker or non-drinker

Question 10

Which statistical test should be used?
Some people argue that exposure to cold weather causes the common cold. Researchers tested this supposed link by selecting a sample of school children and developed a scale for how often they played outside (1 represents never and 10 is always joins in). They also developed a scale for the number of colds with 1 representing very few and 5 is very frequently.

Answer 10

Spearman’s Rho
Correlation between playing outside and colds
Ordinal level data - based on opinions

Question 11

Which stats test would be appropriate?
Test of difference, matched pairs & Nominal data

Answer 11

Sign Test

Question 12

Which stats test would be appropriate?
Test of difference, independent measures & ordinal level data

Answer 12

Mann Whitney

Question 13

Which stats test would be appropriate?
Test of correlation, and interval level data

Answer 13

Pearson’s r

Question 14

Which stats test would be appropriate?
Test of difference, independent measures and interval level data

Answer 14

Unrelated T-test

Question 15

Which stats test would be appropriate?
Test of correlation and ordinal level data

Answer 15

Spearman’s Rho

Question 16

Which stats test would be appropriate?
Test of correlation and nominal data

Answer 16

Chi Square

Question 17

Which stats test would be appropriate?
Repeated measures, test of difference and interval data

Answer 17

Related-T-test

Question 18

Which stats test would be appropriate?
Test of difference, Matched pairs and Nominal data

Answer 18

Sign Test

Question 19

When should you use a Sign test?

Answer 19

Test of difference
Repeated or matched pairs
Nominal data

Question 20

When should you use a Wilcoxon test?

Answer 20

Test of difference
Repeated or matched pairs
Ordinal data

Question 21

When should you use a Related t-test?

Answer 21

Test of difference
Repeated or matched pairs
Interval data

Question 22

When should you use a chi square?

Answer 22

Test of difference, independent measures and nominal data

or

Test of correlation, nominal data

Question 23

When should you use a Mann Whitney U test?

Answer 23

Test of difference
Independent measures,
Ordinal data

Question 24

When should you use an Unrelated T-test?

Answer 24

Test of difference
Independent measures
Interval data

Question 25

When should you use a Spearman’s Rho?

Answer 25

Test of correlation
Ordinal level data

Question 26

When should you use a Pearson’s r?

Answer 26

Test of correlation
Ordinal level data