Question 1

If a distribution is skewed, the mean may be a misleading measure of central tendency.

Accepted Answer

A) True 
 B)False

Question 2

A weighted mean is used when two samples have different Ns.

Accepted Answer

A) True 
 B)False

Question 3

Imagine a bar graph with the following categories and frequencies: Alpha, 2; Beta, 4; Gamma, 1; Delta, 5. The central tendency statistic that is appropriate and its value:

Accepted Answer

A)  median, 5 
B)  median, 3 
C)  mode, 5 
D)  mode, Delta. 
A)  median, 5 
B)  median, 3 
C)  mode, 5 
D)  mode, Delta.

Question 4

The overall mean of 2 samples with different Ns is the sum of the two means divided by 2.

Accepted Answer

A) True 
 B)False

Question 5

The benefits of estimating an answer before beginning to work the problem include

Accepted Answer

A)  noticing that a final answer seems way off 
B)  correcting an error before anyone else sees it 
C)  improved understanding of the problem 
D)  all of the other alternatives are correct. 
A)  noticing that a final answer seems way off 
B)  correcting an error before anyone else sees it 
C)  improved understanding of the problem 
D)  all of the other alternatives are correct.

Question 6

Find the mean, median, and mode and tell the direction of skew, if any. $$\begin{array} { l l } 
X & f \
\hline 7 & 2 \
6 & 3 \
5 & 5 \
4 & 3 \
3 & 3 \
2 & 3
\end{array}$$

Accepted Answer

None

Question 7

The mean is an appropriate measure of central tendency with open-ended distributions.

Accepted Answer

A) True 
 B)False

Question 8

Your textbook recommends, as a first step in working a problem, that you

Accepted Answer

A)  check for errors 
B)  estimate the answer 
C)  check the source 
D)  build a database 
A)  check for errors 
B)  estimate the answer 
C)  check the source 
D)  build a database

Question 9

Usually, a frequency distribution with a mean of 100 and a median of 90 is

Accepted Answer

A)  positively skewed 
B)  negatively skewed 
C)  symmetrical 
D)  cannot be determined without knowing the mode. 
A)  positively skewed 
B)  negatively skewed 
C)  symmetrical 
D)  cannot be determined without knowing the mode.

Question 10

Find the median of each distribution below.
-$$\begin{array} { l l } 
X & f \
\hline 29 & 2 \
28 & 5 \
27 & 7 \
26 & 9 \
25 & 6 \
24 & 4
\end{array}$$

Accepted Answer

\[\begin{array} { l } 
\mathrm

Question 11

Your text noted which of the following as a characteristic of the mean of a set of scores?

Accepted Answer

A)  The sum is zero when the mean is subtracted from each score and these differences summed. 
B)  The sum of the results of scoring the difference between each score and the mean is a minimum. 
C)  Both of the descriptive alternatives. 
D)  Neither of the descriptive alternatives. 
A)  The sum is zero when the mean is subtracted from each score and these differences summed. 
B)  The sum of the results of scoring the difference between each score and the mean is a minimum. 
C)  Both of the descriptive alternatives. 
D)  Neither of the descriptive alternatives.

Question 12

The median of 4, 3, 4, 2, 3, 4, 4, is

Accepted Answer

A)  3 
B)  3.5 
C)  4.5 
D)  4 
A)  3 
B)  3.5 
C)  4.5 
D)  4

Question 13

In a negatively skewed curve the mean is usually

Accepted Answer

A)  larger than the median 
B)  smaller than the median 
C)  exactly equal to the median 
D)  not  . 
A)  larger than the median 
B)  smaller than the median 
C)  exactly equal to the median 
D)  not  .

Question 14

A characteristic of the mean is that $\Sigma ( X - \bar { X } )$ is a minimum but greater than 0.

Accepted Answer

A) True 
 B)False

Question 15

Data Set 3-4
The descriptive statistics for these data are approximately the same as those of a freshman class at a small private college.
 $$\begin{array} { c c } 
\text { ACT Scores } & f \
\hline 34 & 1 \
29 & 1 \
25 & 3 \
24 & 3 \
23 & 5 \
22 & 3 \
15 & 1
\end{array}$$
-The mode of Data Set 3-4 is

Accepted Answer

A)  3 
B)  5 
C)  22 
D)  23. 
A)  3 
B)  5 
C)  22 
D)  23.

Question 16

The mode can be found for skewed distributions and open-ended distributions.

Accepted Answer

A) True 
 B)False

Question 17

For continuous data that are positively skewed, the mean is usually smaller than the median.

Accepted Answer

A) True 
 B)False

Question 18

For continuous data that are positively skewed, the mean is usually larger than the median

Accepted Answer

A) True 
 B)False

Question 19

A distribution of scores had a mean of 30 and a median of 40. In the usual case of continuous data, the distribution is

Accepted Answer

A)  positively skewed 
B)  negatively skewed 
C)  symmetrical 
D)  need to know the mode to make a decision. 
A)  positively skewed 
B)  negatively skewed 
C)  symmetrical 
D)  need to know the mode to make a decision.

Question 20

The mean is appropriate for all four scales of measurement.

Accepted Answer

A) True 
 B)False

If a distribution is skewed, the mean may be a misleading measure of central tendency.

A weighted mean is used when two samples have different Ns.

Imagine a bar graph with the following categories and frequencies: Alpha, 2; Beta, 4; Gamma, 1; Delta, 5. The central tendency statistic that is appropriate and its value:

The overall mean of 2 samples with different Ns is the sum of the two means divided by 2.

The benefits of estimating an answer before beginning to work the problem include

Find the mean, median, and mode and tell the direction of skew, if any. X f 7 2 6 3 5 5 4 3 3 3 2 3

The mean is an appropriate measure of central tendency with open-ended distributions.

Your textbook recommends, as a first step in working a problem, that you

Usually, a frequency distribution with a mean of 100 and a median of 90 is

Find the median of each distribution below. - X f 29 2 28 5 27 7 26 9 25 6 24 4

Your text noted which of the following as a characteristic of the mean of a set of scores?

The median of 4, 3, 4, 2, 3, 4, 4, is

In a negatively skewed curve the mean is usually

A characteristic of the mean is that $\Sigma ( X - \bar { X } )$ is a minimum but greater than 0.

Data Set 3-4 The descriptive statistics for these data are approximately the same as those of a freshman class at a small private college. ACT Scores f 34 1 29 1 25 3 24 3 23 5 22 3 15 1 -The mode of Data Set 3-4 is

The mode can be found for skewed distributions and open-ended distributions.

For continuous data that are positively skewed, the mean is usually smaller than the median.

For continuous data that are positively skewed, the mean is usually larger than the median

A distribution of scores had a mean of 30 and a median of 40. In the usual case of continuous data, the distribution is

The mean is appropriate for all four scales of measurement.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Theoretical Distributions Including the Normal Distribution

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

Exam 3: Exploring Data: Central Tendency

If a distribution is skewed, the mean may be a misleading measure of central tendency.

A weighted mean is used when two samples have different Ns.

Imagine a bar graph with the following categories and frequencies: Alpha, 2; Beta, 4; Gamma, 1; Delta, 5. The central tendency statistic that is appropriate and its value:

The overall mean of 2 samples with different Ns is the sum of the two means divided by 2.

The benefits of estimating an answer before beginning to work the problem include

Find the mean, median, and mode and tell the direction of skew, if any. X f 7 2 6 3 5 5 4 3 3 3 2 3

The mean is an appropriate measure of central tendency with open-ended distributions.

Your textbook recommends, as a first step in working a problem, that you

Usually, a frequency distribution with a mean of 100 and a median of 90 is

Find the median of each distribution below. - X f 29 2 28 5 27 7 26 9 25 6 24 4

Your text noted which of the following as a characteristic of the mean of a set of scores?

The median of 4, 3, 4, 2, 3, 4, 4, is

In a negatively skewed curve the mean is usually

A characteristic of the mean is that Σ(X−Xˉ)\Sigma ( X - \bar { X } )Σ(X−Xˉ) is a minimum but greater than 0.

Data Set 3-4 The descriptive statistics for these data are approximately the same as those of a freshman class at a small private college. ACT Scores f 34 1 29 1 25 3 24 3 23 5 22 3 15 1 -The mode of Data Set 3-4 is

The mode can be found for skewed distributions and open-ended distributions.

For continuous data that are positively skewed, the mean is usually smaller than the median.

For continuous data that are positively skewed, the mean is usually larger than the median

A distribution of scores had a mean of 30 and a median of 40. In the usual case of continuous data, the distribution is

The mean is appropriate for all four scales of measurement.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Theoretical Distributions Including the Normal Distribution

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

A characteristic of the mean is that $\Sigma ( X - \bar { X } )$ is a minimum but greater than 0.