Exam 3 Pg 3 & 5

Question 1

A professor at a university ranks subjects based on students’ preferences identified through a survey. He ranks science first, mathematics second, and management third. What type of measurement scale has the professor employed?

Answer 1

Ordinal

Question 2

the difference between an interval and a RATIO SCALE is that a ratio scale _____, while an INTERVAL SCALE DOES NOT.

Answer 2

has an absolute zero

Question 3

When a line graph is employed to represent the number of subjects who received each possible score on a variable, the graph is called a _____.

Answer 3

frequency polygon

Question 4

When graphically depicting frequency distributions, a _____ uses bars to display a frequency distribution for a quantitative variable.

Answer 4

histogram

Question 5

The _____ of a set of scores is obtained by adding all the scores and dividing by the number of scores.

Answer 5

mean

Question 6

The _____ is a measure of variability that is simply the difference between the highest score and the lowest score.

Answer 6

range

Question 7

which of the following statements is true of the correlation coefficient?

Answer 7

It is a statistic that describes how strongly variables are related to one another.

Question 8

The Pearson product-moment correlation coefficient (r) does not detect:

Answer 8

curvilinear relationships

Question 9

_____ refers to the strength of association between variables

Answer 9

Effect size

Question 10

The general form of a regression equation is _____.

Answer 10

Y = a + bX

Question 11

Multiple correlation is a technique for:

Answer 11

Increasing the accuracy of a prediction

Question 12

A correlation coefficient can be used when both variables use:

Answer 12

interval or ratio scale properties.

Question 13

Tevy reports that individuals who follow her diet plan lose more weight than individuals who follow Jake’s diet plan. In actuality, there is no difference in weight loss between those following Tevy’s diet plan and those following Jake’s diet plan. In this case, Tevy’s claim illustrates a _____ error.

Answer 13

Type I

Question 14

The probability of making a Type II error increases when the:

Answer 14

The effect size is small

Question 15

When examining the strength of the relationship between study time and test score, the null hypothesis would suggest that the true population correlation is:

Answer 15

equal to 0.00.

Question 16

Ethan concludes that there is no difference in the driving ability of drivers who have consumed one can of beer and those who have consumed three cans of beer. However, there actually is a difference in the driving ability of the drivers. In this case, Ethan has made a(n) _____ error.

Answer 16

Type II