8.If I find a correlation of .25 between hours of sleep and exam scores

a.this means r squared is .0625

b.this means it is a significant relationship

c.this means r squared is .05

d.this means it is not a significant relationship

9.I have a sample of 100 people,25of them buy ford,30of them buy toyota, and 45 of them buy hyundai.

If I want to see if people are purchasing one of these more than another I should compare the rate to population proportions of

a.25%, 30% and 45%for each group

b.33% for each group

c.There is no way to tell

10.Which of the following Pearson correlations shows the greatest strength or consistency of relationship?

a. -0.59

b. +0.58

c. +.05

d. -0.33

a.c

b.b

c.d

d.a

11.A sample of n = 90 people is classified into 6 categories.If the results are evaluated with a chi-square test forgoodness of fit, what is the df value for the chi-square statistic?

a.5

b.84

c.15

d.7

12.A researcher has a data set to examine the relations between stressful events and anxiety.He finds that the number of stressful events is on average 3, and that the self reported anxiety score is on average 8.One person in his data set reports stress events of 12and self reported anxiety of 32.He should be concerned that person is

a.none of the answers are correct

b.being untruthful

c.extrapolated beyond the range of his data

d.providing scores that are an outlier in the data set

13.I conduct a correlation study in which I have 15people, each of whom provide a score for weight and a score for height.My dffor this study is

a.13

b.17

c.14

d.28

14.a researcher finds that there is a positive correlation between years of education and income.This means

a.that they share 50%of their variation

b.that education and income are significantly related

c.that every year of additional education adds 10,000dollars to your lifetime salary average

d.that people with little education will always be poor