26. Chi-Squared & Choosing the Right Test

Question 1

When is the Chi-Squared Test used

Answer 1

• Used with nominal data & independent samples

Question 2

What does the Chi-Squared Test test

Answer 2

The Chi-Squared test tests the null hypothesis.

Question 3

See pg132 for 2 worked egs on Chi-Squared Tests

Question 4

What do the expected frequencies tell you in Chi-Squared tests

Answer 4

• In a Chi-Squared test, the expected frequencies tell you what the outcome would be if the null hypothesis was true.
• They indicate that there would be no difference between groups.

Question 5

What do the observed frequencies tell you in Chi-Squared tests

Answer 5

The observed frequencies are the actual results.

Question 6

Comparing the expected & observed frequencies

Answer 6

• If there isa big difference between the expected & the observed frequencies, it is more likely that the results will be significant - they wont match what would happen if the null hypothesis was true.

Question 7

Factors for choosing the right inferential statistic test to use

Answer 7

• Research aims
• Level of measurement
• Types of data
• Experimental design

Question 8

What do Repeated & Independent measures designs test

Answer 8

Repeated & Independent measures designs test to see if there is a significant difference between 2 or more groups of scores.

Question 9

What do Correlation studies test

Answer 9

Correlation studies test to see if there is a significant relationship between 2 variables.

Question 10

See pg133 for table of which tests to use

Question 11

What are Parametric tests

Answer 11

The tests which require interval or ratio data (the related & unrelated t-Tests & Pearson’s r) are called Parametric tests. To use them, the data must be normally distributed.