Deck 2: Frequency Distributions

Question 1

A sample of n = 15 scores ranges from a high of X = 11 to a low of X = 3.If these scores are placed in a frequency distribution table, how many X values will be listed in the first column?

A)8
B)9
C)11
D)15

Answer 1

B

Question 2

For the following distribution, how many people had scores less than X = 19?

Answer 2

D

Question 3

A researcher records the number of traffic tickets issued in each county along the New York State thruway.If the results are presented in a frequency distribution graph, what kind of graph should be used?

A)a bar graph
B)a histogram
C)a polygon
D)either a histogram or a polygon

Answer 3

A

Question 4

What is the total number of scores for the distribution shown in the following table?

Question 5

For the following distribution of quiz scores, if a score of X = 3 or higher is needed for a passing grade, how many individuals passed?

Question 6

What scale of measurement was used to measure the scores in the distribution shown in the following graph?

Question 7

For the following distribution, what is the highest score?

Question 8

If the following distribution was shown in a histogram, the bar above the 15-19 interval would reach from _____ to _____.

Question 9

For the following distribution of quiz scores, How many individuals had a score of X = 2?

Question 10

For the following distribution, how many people had scores greater than X = 14?

Question 11

What frequency distribution graph is appropriate for scores measured on a nominal scale?

A)only a histogram
B)only a polygon
C)either a histogram or a polygon
D)only a bar graph

Question 12

For the following frequency distribution of exam scores, how many students had scores lower than X = 80?

Question 13

For the distribution in the following graph, what is the value of ΣX?

Question 14

In a grouped frequency distribution one interval is listed as 50?59.Assuming that the scores are measuring a continuous variable, what are the real limits of this interval?

A)50 and 59
B)50.5 and 59.5
C)49.5 and 59.5
D)49.5 and 60.5

Question 15

What kind of frequency distribution graph shows the frequencies as bars, with no space between adjacent bars?

A)a bar graph
B)a histogram
C)a polygon
D)all of the above

Question 16

For the following distribution, what is the width of each class interval?

Question 17

For the following frequency distribution of quiz scores, how many individuals took the quiz?

Question 18

In a frequency distribution graph, frequencies are presented on the and the scores (categories) are listed on the .

A)X axis/Y axis
B)horizontal line/vertical line
C)Y axis/X axis
D)class interval/horizontal line

Question 19

The classrooms in the Psychology department are numbered from 100 to 108.A professor records the number of classes held in each room during the fall semester.If these values are presented in a frequency distribution graph, what kind of graph would be appropriate?

A)a histogram
B)a polygon
C)a histogram or a polygon
D)a bar graph

Question 20

For the following frequency distribution of exam scores, what is the lowest score on the exam?

Question 21

If a frequency distribution is shown in a bar graph, what scale was used to measure the scores?

A)nominal
B)nominal or ordinal
C)ratio
D)interval or ratio

Question 22

For the distribution in the following table, what is the percentile rank for X = 7?

Question 23

A skewed distribution typically has _____ tail(s) and a normal distribution has ____ tail(s).

A)1, 1
B)1, 2
C)2, 1
D)2, 2

Question 24

For the distribution in the following table, what is the 50^th percentile?

Question 25

For the distribution in the following table, what is the percentile rank for X = 24.5?

Question 26

The normal distribution is an example of

A)a histogram showing data from a sample
B)a polygon showing data from a sample
C)a bar graph showing data from a population
D)a smooth curve showing data from a population

Question 27

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

A)symmetrical
B)positively skewed
C)negatively skewed
D)normal

Question 28

For the distribution in the following table, what is the percentile rank for X = 32?

Question 29

For the distribution in the following table, what is the 90^th percentile

Question 30

For the distribution in the following table, what is the 50^th percentile?

Question 31

For the scores shown in the following stem and leaf display, what is the highest score in the distribution?

Question 32

For the distribution in the following table, what is the 90^th percentile?

Question 33

The students in a psychology class seemed to think that the midterm exam was very easy.If they are correct, what is the most likely shape for the distribution of exam scores?

A)symmetrical
B)positively skewed
C)negatively skewed
D)normal

Question 34

What kind of frequency distribution graph shows the frequencies as bars that are separated by spaces?

A)a bar graph
B)a histogram
C)a polygon
D)all of the above

Question 35

If a set of exam scores forms a symmetrical distribution, what can you conclude about the students scores?

A)Most of the students had relatively high scores.
B)Most of the students had relatively low scores.
C)About 50% of the students had high scores and the rest had low scores.
D)It is not possible the draw any conclusions about the students' scores.

Question 36

For the distribution in the following table, what is the percentile rank for X = 8.5?

Question 37

If the following scores were placed in a stem and leaf display, how many leaves would be associated with a stem of 6?

Question 38

In a distribution with positive skew, scores with the highest frequencies are _____.

A)on the right side of the distribution
B)on the left side of the distribution
C)in the middle of the distribution
D)represented at two distinct peaks

Question 39

What is the shape for the distribution shown in the following graph?

Question 40

What is the shape of the distribution for the following set of data? Scores: 1, 2, 3, 3, 4, 4, 4 5, 5, 5, 5, 6

A)symmetrical
B)positively skewed
C)negatively skewed
D)cumulative

Question 41

A researcher surveys a sample of n = 200 college students and asks each person to identify his or her favorite movie from the past year.If the data were organized in a frequency distribution table, the first column would be a list of movies.

Question 42

For the following distribution of scores, $\sum$ X = 18. $\begin{array}{ll}X & f \\\hline 4 & 1 \\3 & 2 \\2 & 3 \\1 & 2\end{array}$

Question 43

If a set of scores covers a range of 80 points, the grouped frequency table should use an interval width of 8 points.

Question 44

For the following distribution, seven people have scores greater than X = 14.

Question 45

A grouped frequency distribution table does not provide enough information to obtain a complete listing of the original set of scores.

Question 46

It is customary to list the score categories in a frequency distribution from the highest down to the lowest.

Question 47

A set of scores ranges from X = 18 to X= 91.If the scores are put in a grouped frequency distribution table with an interval width of 10 points, the top interval would be 91-100.

Question 48

A group of quiz scores ranges from 3 to 10, but no student had a score of X = 5.If the scores are put in a frequency distribution table, X = 5 would not be listed in the X column.

Question 49

A set of scores ranges from a low of X = 18 to a high of X = 98.If the scores are put in a grouped frequency distribution table with an interval width of 10 points, the bottom interval should be 10-19.

Question 50

There is a total of n = 5 scores in the distribution shown in the following table.

Question 51

A professor records the number of students who are absent each day for the semester.Because this is a discrete variable, a bar graph should be used to show the frequency distribution.

Question 52

If it is appropriate to present a distribution of scores in a polygon, then it would also be appropriate to present the scores in a bar graph.

Question 53

In a grouped frequency distribution table, one interval is identified as 30-34.This interval has a width of 5 points.

Question 54

For the following distribution of scores, $\sum$ X² = 92. $\begin{array}{ll}X & f \\\hline 4 & 1 \\3 & 2 \\2 & 3 \\1 & 2\end{array}$

Question 55

A grouped frequency distribution table lists one interval as, 20-29.The width of this interval is 9 points.

Question 56

A researcher surveys a sample of n = 200 college students and asks each person to identify his or her favorite movie from the past year.If the results are presented in a frequency distribution graph, the researcher should use a bar graph.

Question 57

For the following distribution of scores, 20% of the individuals have scores of X = 1.

Question 58

In a grouped frequency distribution table, the top value in each class interval should be a multiple of the interval width.

Question 59

A histogram is constructed so that adjacent bars touch.

Question 60

In the following distribution, the scores are grouped into class intervals that are each 5 points wide.

Question 61

For the distribution in the following table, the 90^th percentile is X = 27.5.

Question 62

A stem and leaf display does not provide enough information to obtain a complete listing of the original set of scores.

Question 63

For the distribution in the following table, the 80^th percentile is X = 24.

Question 64

The normal distribution is an example of a symmetrical distribution.

Question 65

The scores for a very easy exam would probably form a positively skewed distribution.

Question 66

A score equal to the 5^th percentile is one of the highest scores in the distribution.

Question 67

If a set of exam scores forms a negatively skewed distribution, it suggests that the majority of the students did not score well on the exam.

Question 68

For the distribution in the following table, the percentile rank for X = 19.5 is 20%.

Question 69

For the distribution in the following table, the percentile rank for X = 25 is 82%.

Question 70

In February in New York, the daily high temperatures are typically low with only a few relatively warm days.A frequency distribution showing the daily high temperatures would probably form a negatively skewed distribution.