CORRELATION QUESTIONS 1-6

1

What is the relationship between the speed of the car and the time it takes to travel 50 kilometers distance?

Select one:

a.Positive linear relationship

b.There is no relationship

c.Negative linear relationship

d.Curvilinear relationship

2

Which of the following represents the strongest linear correlation?

Select one:

a.+.88

b.+.09

c.-.92

d.-.18

3

Suppose you wish to predict a person's score on a paranoia test from his IQ. In

this case, the IQ is called the

Select one:

a.predictor variable

b.really cool variable

c.response variable

d.dependent variable

4

If two variables of interest are totally independent, then the correlation between them is:

Select one:

a.-1

b.1

c.0.01

d.Zero

5

Suppose you wish to be able to predict university grades from high school grades.

In this case, the university grades would be called the

Select one:

a.independent variable

b.predictor variable

c.response variable

d.causal variable

6

Suppose that you would like to predict a person's college GPA from the person's SAT score. In this situation, the SAT score is called the:

Select one:

a.dependent variable

b.predictor variable

c.positive variable

d.response variable

DESCRIPTIVE STATISTICS AND Z SCORES 7-15

7

A student took the Scholastic Aptitude Test (SAP) and obtained A student took the Scholastic Aptitude Test (SAP) and obtained the score 1260. The population average score for SAP is 1060 and the standard deviation is 100. It is known that there is a positive linear relationship between SAP and student's Grade Point Average (GPA). The correlation coefficient between these two variables is r = 0.6. The population GPA average is 3 and the standard deviation is 1.

What is the predicted student's GPA(raw score not standardized score)?

Select one:

a.4.2

b.4.6

c.3.9

d.5.2

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8

Which of the following is a measure of spread?

Select one:

a.Kurtosis

b.Median

c.IQR

d.Skewness

9

What is the sample variance of the five scores, 1, 0, 1, 1, and 2?

Select one:

a.50

b.0.5

c..025

d.0.5

10

Calculate the standard deviation of the following sample: 4, 6, 7, 7.

Select one:

a.1.999

b.1.414

c.1.225

d.2.000

11

A statistics student (Lee) wants to compare his final exam score to his friend Zoey's final exam score from last year. However, the two exams were scored on different scales. Lee asks Zoey for the mean and standard deviation of her class on the exam as well as her final exam score. Given these results, what are Lee and Zoey's Z-scores?

Lee: Final exam score = 85; Class:M= 70;SD= 10

Zoey: Final exam score = 45; Class:M= 35;SD= 5

Select one:

a.Lee,Z= 1.07; Zoey,Z= -1.14

b.Lee,Z= -1.07; Zoey,Z= -1.14

c.Lee,Z= 1.50; Zoey,Z= 2.00

d.Lee,Z= 1.07; Zoey,Z= 1.50

12

A psychologist is interested in studying self-aware and skeptical tendencies in people and develops measures of these two personality characteristics. Self-awareness and skepticism are__________ in the psychologist's research

Select one:

a.

Abstract concepts

b.

Values

c.Invariable constructs

d.

Variables

13

Jake'sZscore for running ability is 0.60. What is Jake's raw score (assumingMean=100 andSD= 7).

Select one:

a.

raw score = 93.5

b.raw score = 103.2

c.raw score = 104.2

d.raw score = 100.1

14

According to a standardised scoring system, a particular nation has a human

rights score of 41 which equals a Z score of 1.3. Assuming that nations' scores

have a normal distribution, what is the percentage of nations above this score?

Select one:

a.-9.68 %

b.9.68 %

c.99.68%

d.59.68%

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15

To draw conclusions about the population based on a sample the researcher should use

Select one:

a.Histogram

b.Descriptive statistics

c.SPSS

d.Inferential statistics