Question 1

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

Accepted Answer

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 
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 B

Question 2

For the following frequency distribution of exam scores, how many students had scores lower than X = 80? $\begin{array}{cc}
x & f \
\hline 90-94 & 3 \
85-89 & 4 \
80-84 & 5 \
75-79 & 2 \
70-74 & 1
\end{array}$

Accepted Answer

A)  2 
B)  3 
C)  7 
D)  cannot be determined 
A)  2 
B)  3 
C)  7 
D)  cannot be determined B

Question 3

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?

Accepted Answer

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

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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?

Accepted Answer

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

Question 6

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?

Accepted Answer

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

Question 7

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

Accepted Answer

A)  $ X=32 $ 
B)  $ X=35 $ 
C)  $ X=37 $
d $ X=39 $ 
A)  $ X=32 $ 
B)  $ X=35 $ 
C)  $ X=37 $
d $ X=39 $

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

If the following scores were placed in a stem and leaf display, how many leaves would be associated with a stem of 6? Scores: $ 26,45,62,11,21,55,66 $ $ 64,55,46,38,41,27,29 $ $ 36,51,32,25,34,44,59 $

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

For the following distribution, seven people have scores greater than X = 14. $\begin{array}{ll}
\underline{X} & f \
\hline 20-24 & 2 \
15-19 & 5 \
10-14 & 4 \
5-9 & 1 \
\hline
\end{array}$

Accepted Answer

A) True 
 B)False

Question 13

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?

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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?

Accepted Answer

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

Question 18

For the following distribution of quiz scores, How many individuals had a score of X = 2? 
$\begin{array}{ll}
X & f \
\hline 5 & 6 \
4 & 5 \
3 & 5 \
2 & 3 \
1 & 2
\end{array}$

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  cannot be determined 
A)  1 
B)  3 
C)  5 
D)  cannot be determined

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

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

For the following frequency distribution of exam scores, how many students had scores lower than X = 80? x f 90-94 3 85-89 4 80-84 5 75-79 2 70-74 1

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?

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

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?

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?

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

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

If the following scores were placed in a stem and leaf display, how many leaves would be associated with a stem of 6? Scores: $26,45,62,11,21,55,66$ $64,55,46,38,41,27,29$ $36,51,32,25,34,44,59$

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

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

For the following distribution, seven people have scores greater than X = 14. f 20-24 2 15-19 5 10-14 4 5-9 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?

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

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.

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

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?

For the following distribution of quiz scores, How many individuals had a score of X = 2? X f 5 6 4 5 3 5 2 3 1 2

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

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

Introduction to Statistics

Central Tendency

Variability

Z-Scores

Probability

The Distribution of Sample Means

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

Exam 2: Frequency Distributions

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

For the following frequency distribution of exam scores, how many students had scores lower than X = 80? x f 90-94 3 85-89 4 80-84 5 75-79 2 70-74 1

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?

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

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?

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?

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

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

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

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

For the following distribution, seven people have scores greater than X = 14. f 20-24 2 15-19 5 10-14 4 5-9 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?

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

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.

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

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?

For the following distribution of quiz scores, How many individuals had a score of X = 2? X f 5 6 4 5 3 5 2 3 1 2

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

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

Introduction to Statistics

Central Tendency

Variability

Z-Scores

Probability

The Distribution of Sample Means

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

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

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

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