W5

Question 1

What can you run instead of doing multiple T tests?

Answer 1

A 1-way independent ANOVA

Question 2

Good or bad if the homogeneity of variance is greater than 0.05

Answer 2

Good

Question 3

What does ANOVA ask the question of?

Answer 3

How successful the experimental manipulation has been in comparison to the natural variability that exists

Question 4

What does ANOVA compare?

Answer 4

Type of variance you want (effect variance) with the type of variance you don’t want (error variance).

Question 5

When do significant effects occur in the independent ANOVA?

Answer 5

When you have 4 times as much variance between your groups as you do within your groups.

Question 6

Equation for f-ratio

Answer 6

Variability between treatment conditions / variability within treatment conditions

Effect + error / error

Question 7

Q. Calculate the population variance of the following numbers:

81, 92, 67, 84, 76

Answer 7

69.20

1. Calculate mean
2. Subtract mean from each value in data set = deviance.
3. Square all deviance values
4. Total all deviance values
5. Divide total by no of data.

Question 8

Q. What is the ratio between effect variance and error variance called?

Answer 8

F ratio

Question 9

Q. True or false? The lack of a significant p value does not enable you to conclude that the intervention had no effect.

Answer 9

True

Question 10

Q. In an independent ANOVA if the SSwithin value is 312.45 and the dfwithin value is 14. What is the MSwithin value?

Answer 10

22.32

Question 11

Q. In an independent ANOVA if the SSbetween value is 259.78 and the dfbetween value is 2. What is the MSbetween value?

Answer 11

129.89

Question 12

In an independent ANOVA you have 3 groups with the following means:
Group 1: 28, 26, 37, 39, 14
Group 2: 31, 22, 32, 28, 19
Group 3: 15, 17, 21, 27, 32
What is the SS value for the means (SSm)?

Answer 12

20.91

Question 13

Q. What value is calculated to counteract the effect of extreme values on the range of a data set?

Answer 13

IQ range

Question 14

Q. In an independent ANOVA if the SSbetween value is 198.74 and the SStotal value is 502.47.What is the effect size (ŋp2)?

Answer 14

0.40

Question 15

Q. True or False? The standard error is smaller than the standard deviation.

Answer 15

True

Question 16

Q. Your output from a one way independent ANOVA revels a p value of 0.079. Is there a significant difference between the groups?

Answer 16

No

Question 17

Q. In an independent ANOVA you have 3 groups each with 10 participants. If your SSm value is 22.48, what is your SSbetween value?

Answer 17

224.80

Question 18

Q. You have an F ratio of 3.98 and your critical value table for your degrees of freedom shows a critical value of 3.89. Are your findings significant?

Answer 18

Yes

Question 19

Q. What is another term for the deviance squared?

Answer 19

Sum of squared errors

Question 20

Q. In an independent ANOVA if the SSwithin value is 347.21 and the dfwithin value is 15. What is the MSwithin value?

Answer 20

23.15

Question 21

Q. In an independent ANOVA you have 3 groups each with 8 participants. If your SSm value is 24.16, what is your SSbetween value?

Answer 21

193.28

Question 22

Q. True or false? A Bonferroni correction can be used to mathematically account for an increased error rate.

Answer 22

True

Question 23

Q. What is another word for p value?

Answer 23

Alpha

Question 24

In an independent ANOVA if the SSbetween value is 398.59 and the dfbetween value is 3. What is the MSbetween value?

Answer 24

132.86

Question 25

Q. What can we use to determine if our F ratio is significant?

Answer 25

Critical value table

Question 26

Q. How do we describe a relationship between two variables that obviously are not affected by each other?

Answer 26

Spurious correlation

Question 27

When calculating the sample variance (If values in a data set are from a random sample drawn from some larger population) then we divide the numerator by,

Answer 27

n-1

Question 28

A p value of 0.07 is another way of saying

Answer 28

There is an approximately 7% chance that the observed effect is a chance occurrence

Question 29

If the null hypothesis is true, the ANOVA F values is expected to be close to

Answer 29

1

Question 30

If the null hypothesis is false, the ANOVA F value is expected to be

Answer 30

Substantially greater than 1

Question 31

If the F statistic is greater than the critical value of F, the null hypothesis should be

Answer 31

Rejected

Question 32

Dividing the Sum of Squares (SS) by the degree of freedom (df) results in what

Answer 32

Mean sum of squares

Question 33

The MSbetween is divided by MSwithin to produce the

Answer 33

F value

Question 34

The most common effect size used for an ANOVA is partial eta squared. If a study were to be done in which treatments for the effective of three different diets for weight loss were compared and partial eta squared = .22, which of the following would be the best interpretation of partial eta squared?

Answer 34

The type of diet people received explained 22% of the variability in weight loss

Question 35

The null hypothesis in ANOVA is that

Answer 35

all the sample means are the same

Question 36

Post hoc tests are needed whenever you

Answer 36

Reject the null hypothesis and there were more than two IV conditions

Question 37

When you enter data into SPSS to run an independent one way ANOVA you should have

Answer 37

A column for the independent variable and a column fro the dependent variable

Question 38

How do you compute the dfbetween

Answer 38

No. of treatment conditions - 1

Question 39

How do you compute dfwithin?

Answer 39

No. Ppl in study - no. of treatment groups

Question 40

If tow separate studies have the same dfbetween and the same dfwithin which of the following statements are true?

Answer 40

The Critical value for F is the same for both studies

Question 41

When treatment conditions vary in their effectiveness (i.e. some treatments are better tha others) the data will tend to have what?

Answer 41

large MSwithin