Testing Parametric Assumptions

Question 1

what do parametric tests assume?

Answer 1

• data is normally distributed
• groups have equal variance
• interval/ratio data

Question 2

homogeneity of variance

Answer 2

equal variance

Question 3

when can parametric tests be abused?

Answer 3

when data does not meet the underlying assumptions of tests

Question 4

difference between non-parametric tests

Answer 4

• they do not make assumptions about population distributions
• less powerful and flexible than parametric tests

Question 5

when is the kolmogrov-smirnov test used?

Answer 5

to determine the likelihood of data belonging to a normal distribution

Question 6

k-s test: if the observed value is less than 0.05…

Answer 6

• this is significant
• not normally distributed
• parametric test cannot be used

Question 7

k-s test: if the observed value is above 0.05…

Answer 7

• this is not significant
• data is normally distributed
• parametric test may be used

Question 8

when is the levenes test used?

Answer 8

to test for homogeneity of variance, and determine data sets are from the same population

Question 9

levenes test: if the probability is below 0.05…

Answer 9

• this is significant
• accept experimental hypothesis
• conclude there is not equal variance

Question 10

levenes test: if the probability is above 0.05…

Answer 10

• not significant
• can assume there is equal variance

Question 11

what is needed to perform a parametric test?

Answer 11

• normally distributed data
• equal variance between samples

Question 12

report writing

Answer 12

• title
• abstract
• introduction
• method
• results
• discussion
• references
• appendices

Question 13

title

Answer 13

provides a succinct statement of the core purpose of the research

Question 14

abstract

Answer 14

short overview of the research (150-250 words) which states key variables, participants, and results

Question 15

introduction

Answer 15

must introduce the general topic, theories relating to the topic, relevant research, and the specific hypothesis

Question 16

method

Answer 16

specific information regarding how the study was conducted
- participants
- design
- materials
- procedure

Question 17

results

Answer 17

details of all data produced, and relevant descriptive and inferential statistics

Question 18

references

Answer 18

provide information about the source of all the research

Question 19

appendices

Answer 19

extra information, e.g., raw data, consent form, instructions