Question 1

For the data in the following table,what is the value of ?X? $$\begin{array} { l l } 
X & f \
\hline 4 & 1 \
3 & 2 \
2 & 4 \
1 & 2 \
\hline
\end{array}$$

Accepted Answer

A) 10 
B) 15 
C) 20 
D) Cannot be determined from the table 
A) 10 
B) 15 
C) 20 
D) Cannot be determined from the table

Question 2

A histogram is constructed so that adjacent bars touch.

Accepted Answer

A) True 
 B)False

Question 3

If a set of exam scores forms a negatively skewed distribution,what can you likely conclude about the students' scores?

Accepted Answer

A) Most of the students had relatively high scores. 
B) Most of the students had relatively low scores. 
C) About an equal number of students had relatively high and relatively low scores. 
D) It is not possible to draw any conclusions about students' scores. 
A) Most of the students had relatively high scores. 
B) Most of the students had relatively low scores. 
C) About an equal number of students had relatively high and relatively low scores. 
D) It is not possible to draw any conclusions about students' scores.

Question 4

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

Accepted Answer

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

Question 5

A set of scores ranges from a high of X = 96 to a low of X = 11.If these scores were placed in a grouped frequency distribution table,what is the best value for the interval width?

Accepted Answer

A) 5 points 
B) 8 points 
C) 9 points 
D) 10 points 
A) 5 points 
B) 8 points 
C) 9 points 
D) 10 points

Question 6

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

Question 7

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.

Accepted Answer

A) True 
 B)False

Question 8

For the following distribution of quiz scores,if a score of X = 3 or higher is needed for a passing grade,how many individuals failed the quiz? $$\begin{array} { l l } 
X & f \
\hline 5 & 6 \
4 & 5 \
3 & 5 \
2 & 3 \
1 & 2
\end{array}$$

Accepted Answer

A) 2 X f 
B) 3 5 6 
C) 5 4 5 
D) 10 	3 5 2 3
1 2 
A) 2 X f 
B) 3 5 6 
C) 5 4 5 
D) 10 	3 5 2 3
1 2

Question 9

Which types of graphs are used for data from an interval scale?

Accepted Answer

A) Histograms and bar graphs 
B) Polygons and bar graphs 
C) Histograms and polygons 
D) Histograms, bar graphs, and polygons 
A) Histograms and bar graphs 
B) Polygons and bar graphs 
C) Histograms and polygons 
D) Histograms, bar graphs, and polygons

Question 10

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

Question 11

For the distribution shown in the following table,N = 5.
$$\begin{array} { c l } 
X & \mathrm { f } \
\hline 5 & 2 \
4 & 8 \
3 & 5 \
2 & 3 \
1 & 2
\end{array}$$

Accepted Answer

A) True 
 B)False

Question 12

A researcher collects a sample of n = 20 Introductory Psychology textbooks and records the number of pages in each book.The results are then placed in a grouped frequency distribution table using intervals of 0-99 pages,100-199 pages,200-299 pages,and so on.If the results were converted into a frequency distribution graph,what kind of graph should be used?

Accepted Answer

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

Question 13

For the following distribution,what percentage of the individuals have scores of X = 1? $$\begin{array} { l l } 
X & \mathrm { f } \
\hline 5 & 2 \
4 & 8 \
3 & 5 \
2 & 3 \
1 & 2
\end{array}$$

Accepted Answer

A) 2% 
B) 5% 
C) 10% 
D) 20% 
A) 2% 
B) 5% 
C) 10% 
D) 20%

Question 14

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

Accepted Answer

A) 1; 1 
B) 1; 2 
C) 2; 1 
D) 2; 2 
A) 1; 1 
B) 1; 2 
C) 2; 1 
D) 2; 2

Question 15

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 16

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.

Accepted Answer

A) True 
 B)False

Question 17

A set of scores ranges from a high of X = 24 to a low of X = 5.If these scores were put in a frequency distribution table with an interval width of 2 points,which of the following would be the top interval in the table?

Accepted Answer

A) 4-5 
B) 23-24 
C) 24-25 
D) 22-24 
A) 4-5 
B) 23-24 
C) 24-25 
D) 22-24

Question 18

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

Accepted Answer

A) A bar graph 
B) A histogram 
C) A polygon 
D) All of these 
A) A bar graph 
B) A histogram 
C) A polygon 
D) All of these

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 the results were presented in a frequency distribution graph,the professor should use a bar graph.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

For the data in the following table,what is the value of ?X? X f 4 1 3 2 2 4 1 2

A histogram is constructed so that adjacent bars touch.

If a set of exam scores forms a negatively skewed distribution,what can you likely conclude about the students' scores?

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

A set of scores ranges from a high of X = 96 to a low of X = 11.If these scores were placed in a grouped frequency distribution table,what is the best value for the interval width?

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 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.

For the following distribution of quiz scores,if a score of X = 3 or higher is needed for a passing grade,how many individuals failed the quiz? X f 5 6 4 5 3 5 2 3 1 2

Which types of graphs are used for data from an interval scale?

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

For the distribution shown in the following table,N = 5. X 5 2 4 8 3 5 2 3 1 2

For the following distribution,what percentage of the individuals have scores of X = 1? X 5 2 4 8 3 5 2 3 1 2

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

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 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.

A set of scores ranges from a high of X = 24 to a low of X = 5.If these scores were put in a frequency distribution table with an interval width of 2 points,which of the following would be the top interval in the table?

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

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 the results were presented in a frequency distribution graph,the professor should use a bar graph.

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

Introduction to Statistics.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: 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 and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

Filters

Exam 2: Frequency Distributions.

For the data in the following table,what is the value of ?X? X f 4 1 3 2 2 4 1 2

A histogram is constructed so that adjacent bars touch.

If a set of exam scores forms a negatively skewed distribution,what can you likely conclude about the students' scores?

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

A set of scores ranges from a high of X = 96 to a low of X = 11.If these scores were placed in a grouped frequency distribution table,what is the best value for the interval width?

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 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.

For the following distribution of quiz scores,if a score of X = 3 or higher is needed for a passing grade,how many individuals failed the quiz? X f 5 6 4 5 3 5 2 3 1 2

Which types of graphs are used for data from an interval scale?

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

For the distribution shown in the following table,N = 5. X 5 2 4 8 3 5 2 3 1 2

For the following distribution,what percentage of the individuals have scores of X = 1? X 5 2 4 8 3 5 2 3 1 2

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

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 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.

A set of scores ranges from a high of X = 24 to a low of X = 5.If these scores were put in a frequency distribution table with an interval width of 2 points,which of the following would be the top interval in the table?

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

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 the results were presented in a frequency distribution graph,the professor should use a bar graph.

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

Introduction to Statistics.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: 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 and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

Filters

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