Question

5. When you are evaluating the difference between population means (quantitative dependent variable), with more than 2 categories of the independent variable, the most appropriate statistical test to utilize would be a one variable chi-square test. True False

6. A calculated correlation coefficient of 0.99 between variables A and B implies that variable A causes variable B.

True

False

7. Which of the following is NOT a possible value for a calculated F statistic?

21.64

0.92

4.82

-2.19

All of the listed choices are possible values for a calculated F statistic.

8. A large student organization at CSUN claims it has an equal distribution of people from each of the 9 colleges (e.g., business, humanities). You are interested in investigating whether or not this claim is accurate. To do so, you first take a sample of students from the organization. What would be the most appropriate test to utilize with your sample data to help answer this research question?

One-factor ANOVA

One variable chi-square test

Two variable chi-square test

Correlation

None of the above tests would be appropriate.

9. You are presented with 4 different correlation coefficients (r): 0.65, -0.34, -0.86, and 0.19. Which of the following lists correctly represents the 4 r’s placed in order of strength from weakest to strongest.

-0.86, -0.34, 0.19, 0.65

0.19, -0.34, 0.65, -0.86

0.65, 0.19, -0.34, -0.86

-0.34, -0.86, 0.65, 0.19

0.65, -0.86, 0.19, -0.34

10.

In which direction is the χ² (chi-square) distribution skewed?

Positively

Negatively

No skew

Below 0

None of the listed choices are correct.

Answer 1

5. When you are evaluating the difference between population means (quantitative dependent variable), with more than 2 categories of the independent variable, the most appropriate statistical test to utilize would be a one variable chi-square test.

when more then 2 group we go for ONE WAY ANOVA to test for difference in means

FALSE

Solution6:

r=0.9

correaltion gives relationship between 2 variables

correlation does not imply causation

FALSE

Solution7:

7. Which of the following is NOT a possible value for a calculated F statistic?

F statistic ca n never be negative

For ex:

take 3 groups x,y,z

ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	14.83333	2	7.416667	0.635714	0.557585	4.737414
Within Groups	81.66667	7	11.66667
From ANOVA table we see F is positive

ANSWER:

-2.19

9. You are presented with 4 different correlation coefficients (r): 0.65, -0.34, -0.86, and 0.19. Which of the following lists correctly represents the 4 r’s placed in order of strength from weakest to strongest.

see this table

-0.86, -0.34, 0.19, 0.65

CORRECT ANSWER:

-0.86, -0.34, 0.19, 0.65

In which direction is the χ2 (chi-square) distribution skewed?

SKEWED TO RIGHT

Positively