QUESTION 21

1. A frequency distribution graph represents frequencies associated with scores for a variable with vertical bars that have space between them. Which scale of measurement was used to measure this variable?

	a.	ordinal
	b.	nominal
	c.	ratio
	d.	interval

QUESTION 22

1. A sample ofn= 12 scores ranges from a high ofX= 7 to a low ofX= 4. If these scores are placed in a frequency distribution table, how manyXvalues will be listed in the first column?

	a.	12
	b.	3
	c.	7
	d.	4

QUESTION 23

1. Which statement below is correct regarding a grouped frequency distribution table?

	a.	The bottom score in each class interval should be divisible by 5.
	b.	The x cannot be determined.
	c.	The f cannot be determined.
	d.	Interval widths should be restricted to either 10 or 20.

QUESTION 24

1. For the following grouped frequency distribution table of exam scores, what is the lowest score on the exam?

X f

90-99 3

80-89 1

70-79 2

60-69 3

50-59 4

	a.	X= 74
	b.	Cannot be determined
	c.	X= 90
	d.	X= 70

QUESTION 25

1. A biologist records the number and types of fish caught in a local lake during a 2- year period. The biologist reports that 7% of the fish caught during this period were trout, whereas 43% of the fish caught were bass. These reports of the number of trout and bass at this lake are examples of _____.

	a.	smooth curves.
	b.	cumulative frequencies.
	c.	relative frequencies.
	d.	percentile ranks.

QUESTION 26

1. In a grouped frequency distribution table, one interval is listed as 35-39. If the scores represent a continuous variable, what are the real limits for this interval?

	a.	35.5 and 39.5
	b.	35.25 and 39.25
	c.	34.5 and 39.5
	d.	34 and 40

QUESTION 27

1. For the following grouped frequency distribution table, what is the width of each class interval?

X f

20-29 2

30-39 5

40-49 4

50-59 1

	a.	9
	b.	10
	c.	2
	d.	5

QUESTION 28

1. For the data in the following table, what is the value ofX?

X f

4 1

3 0

2 2

1 1

	a.	13
	b.	10
	c.	4
	d.	9

QUESTION 29

1. What is the shape of the distribution for the following set of data? Scores: 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5

	a.	positively skewed
	b.	symmetrical
	c.	negatively skewed
	d.	normal

QUESTION 30

1. Which of the following statements pertaining to skewed and normal distributions is correct?

	a.	A skewed distribution tends to have one tail, and a normal distribution tends to have two tails.
	b.	A skewed distribution tends to have lower scores, and a normal distribution tends to have higher scores.
	c.	A skewed distribution tends to have higher scores, and a normal distribution tends to have lower scores.
	d.	A skewed distribution tends to have two tails, and a normal distribution tends to have one tail.

QUESTION 31

1. What is the mean average for the following set of quiz scores? Scores: 4, 5, 9, 2, 3, 7

	a.	6
	b.	10
	c.	5
	d.	4

QUESTION 32

1. In a sample ofn= 6 scores the largest score isX= 10, and the mean isM= 6. If the largest score is changed fromX= 10 toX= 22, then what is the value of the new mean?

	a.	M= 6
	b.	M= 7
	c.	M= 8
	d.	M= 9

QUESTION 33

1. A line graph can be used to graphically represent mean or median values for a data set when the values of a variable are measured using either a(n) _____ scale of measurement.

	a.	nominal or ordinal
	b.	interval or ratio
	c.	nominal or ratio
	d.	ordinal or interval

QUESTION 34

1. The mode is the only measure of central tendency that is appropriate to utilize for a variable measured with which scale of measurement?

	a.	ratio
	b.	ordinal
	c.	nominal
	d.	interval

QUESTION 35

1. A distribution of scores is positively skewed. Which is the most probable order, from smallest to largest, for the three measures of central tendency?

	a.	Mean, median, mode
	b.	Mean, mode, median
	c.	Median, mean, mode
	d.	Mode, median, mean

QUESTION 36

1. One sample withn= 4 scores has a mean ofM= 12, and a second sample withn= 6 scores has a mean ofM= 8. If the two samples are combined, what is the mean for the combined set of scores?

	a.	M= 9.6
	b.	M= 48
	c.	M= 4.8
	d.	M= 10