1.Which of the following are used for data on a nominal or an ordinal scale?

Frequency polygons

Bar graphs

Histograms

All of the above

2.What type of figure shows frequencies as bars, with no space between adjacent bars?

A bar graph

A histogram

A pentagon

All of the above

3.The theoretical normal curve is a perfectly symmetrical curve.

True

False

4.If a set of exam scores forms a negatively skewed frequency distribution, what can you conclude about the set of scores?

Most of the students had relatively high scores

Most of the students had relatively low scores

About half of the students had high scores and about half had low scores

It is not possible to draw any conclusions about the students' scores

5.What term is used to describe the shape of a frequency distribution in which the scores 'pile up' on the left-hand side of the distribution and taper off to the right?

Symmetrical

Negatively skewed

Positively skewed

Normal

6.Almost all of the students in a History class seemed to think the midterm exam was extremely easy and they thought they did very well on the midterm exam. If they are correct, what is the most likely shape for the frequency distribution of exam scores?

Symmetrical

Positively skewed

Negatively skewed

Normal

7.What is the shape of the frequency distribution shown here?

Symmetrical x f

Positively skewed 5 3

Negatively skewed 4 14

Either b or c 3 50

2 14

1 3

8. What is the shape of the frequency distribution shown here?

Negatively skewed X_____f

Positively skewed 5 4

Random 4 5

Symmetrical 3 15

2 28

1 28

9.What is the MEAN for the following scores? Scores: 9, 8, 7, 9, 6, 8, 9

a. 8

b. 7

c. 6

d. 9

10.A limitation or disadvantage of the MEAN is that it is sensitive to extreme scores (outliers) in skewed distributions.

1. True
2. False