Question 1

The text uses a bimodal curve to show a mean and standard deviation on a single graph.

Accepted Answer

A) True 
 B)False

Question 2

Data Set 4-5: 2, 4, 6, 8
-Refer to Data Set 4-5. If these scores were a sample from a larger population to which you wished to generalize, the standard deviation is

Accepted Answer

A)  6.67 
B)  5.00 
C)  2.58 
D)  2.24. 
A)  6.67 
B)  5.00 
C)  2.58 
D)  2.24.

Question 3

The best estimate of the population standard deviation, calculated from a sample is

Accepted Answer

A)  $\hat { s }$ 
B)  S 
C)  $\sigma$ 
D)  range. 
A)  $\hat { s }$ 
B)  S 
C)  $\sigma$ 
D)  range.

Question 4

If the standard deviation of a distribution is greater than one, the variance will be _______ than the standard deviation.

Accepted Answer

A)  larger 
B)  smaller 
C)  could be either larger or smaller 
D)  the same size. 
A)  larger 
B)  smaller 
C)  could be either larger or smaller 
D)  the same size.

Question 5

Choose the statement that is true, according to your text.

Accepted Answer

A)  The pay for people in management is more variable than the pay for those in sales. 
B)  $\hat { S }$ is a biased estimate of $\sigma$ 
C)  In reaching puberty, males are more variable than females. 
D)  All of the other alternatives are correct. 
A)  The pay for people in management is more variable than the pay for those in sales. 
B)  $\hat { S }$ is a biased estimate of $\sigma$ 
C)  In reaching puberty, males are more variable than females. 
D)  All of the other alternatives are correct.

Question 6

The distribution is a set of scores made by a group of 10 students on a quiz in the Psychology Learning course. $\begin{array}{cc}
\quad\quad X   \
\hline 35 & 23 \
32 & 22 \
 29 & 19 \
 24 & 16 \
 23 & 10 \
\end{array}$ 
a. Compute $\sigma$ using the deviation method.
b. Compute $\sigma$using the raw-score method.
c. Compute $\hat { S }$ using either method 
d. What is the variance, $\sigma$2?
e. What is the range?

Accepted Answer

\[\begin{array} { r r r r } 
X & X - \ba

Question 7

Find S using the definitional formula which has
 $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator.
-Scores:4, 3, 1, 1, 1

Accepted Answer

The answer of Find S using the definitional formula which...

Question 8

a.Use the raw-score method to find the standard deviation of the two populations of scores below. $$\begin{array} { l l l l l l l l l l } 
\mathrm { X } _ { 1 } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \
\mathrm { X } _ { 2 } & 1 & 3 & 5 & 7 & 9 & & & &
\end{array}$$ 
b. For the two distributions above, divide the range by the standard deviation. Explain the meaning of your result.

Accepted Answer

a.
  b. 8/2.58= 3.10 8/2.83 =

Question 9

Which of the following is needed in calculating the interquartile range of a distribution?

Accepted Answer

A)  50th percentile 
B)  75th percentile 
C)  95th percentile 
D)  all of the other alternatives are correct. 
A)  50th percentile 
B)  75th percentile 
C)  95th percentile 
D)  all of the other alternatives are correct.

Question 10

Data Set 4-2: 5, 3, 9, 7, 6
-The raw score of 7 in Data Set 4-2 has a deviation score of

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  7. 
A)  0 
B)  1 
C)  2 
D)  7.

Question 11

From the data given here compute: 
 $$\begin{array} { r } 
X \
\hline 10 \
8 \
7 \
6 \
4
\end{array}$$ 
a. $\sigma$ by the deviation method. 
b. $\sigma$ by the raw-score method. 
c. $\hat { S }$ by the deviation method. 
d. $\hat { S }$ by the raw-score method. 
e. the range.

Accepted Answer

None

Question 12

The following hypothetical data were obtained from a random sample of college freshmen. They represent attitude scores toward a statement made by the President, "The economy has improved in the last 12 months."Scores ranged from 7 (strongly agree) to 1 (strongly disagree). The investigator was interested in the variability of attitudes among this year's freshman class on this question.3 , 6 , 5 , 5 , 7 , 4 , 2 , 6 , 5
a. Arrange these data into an appropriate frequency distribution.
b. Calculate the range.
c. Do the numbers constitute a sample or a population?
d. Find the standard deviation.

Accepted Answer

None

Question 13

Find the range, IQR, and $\hat { S }$ $$\begin{array} { l l } 
X & f \
\hline 7 & 1 \
6 & 0 \
5 & 2 \
4 & 3 \
3 & 4 \
2 & \underline { 5 }
\end{array}$$

Accepted Answer

\[\begin{array}{l}
\begin{array} { r r r

Question 14

For a set of data, the ratio of the standard deviation over the range will be about

Accepted Answer

A)  .25 
B)  .75 
C)  1.5 
D)  4. 
A)  .25 
B)  .75 
C)  1.5 
D)  4.

Question 15

The most widely used measure of variability is the interquartile range.

Accepted Answer

A) True 
 B)False

Question 16

The interquartile range is 0.25 times the range.

Accepted Answer

A) True 
 B)False

Question 17

The most widely used measure of variability is the range.

Accepted Answer

A) True 
 B)False

The text uses a bimodal curve to show a mean and standard deviation on a single graph.

Data Set 4-5: 2, 4, 6, 8 -Refer to Data Set 4-5. If these scores were a sample from a larger population to which you wished to generalize, the standard deviation is

The best estimate of the population standard deviation, calculated from a sample is

If the standard deviation of a distribution is greater than one, the variance will be _______ than the standard deviation.

Choose the statement that is true, according to your text.

Find S using the definitional formula which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator. -Scores:4, 3, 1, 1, 1

a.Use the raw-score method to find the standard deviation of the two populations of scores below. 1 2 3 4 5 6 7 8 9 1 3 5 7 9 b. For the two distributions above, divide the range by the standard deviation. Explain the meaning of your result.

Which of the following is needed in calculating the interquartile range of a distribution?

Data Set 4-2: 5, 3, 9, 7, 6 -The raw score of 7 in Data Set 4-2 has a deviation score of

From the data given here compute: X 10 8 7 6 4 a. $\sigma$ by the deviation method. b. $\sigma$ by the raw-score method. c. $\hat { S }$ by the deviation method. d. $\hat { S }$ by the raw-score method. e. the range.

Find the range, IQR, and $\hat { S }$ X f 7 1 6 0 5 2 4 3 3 4 2

For a set of data, the ratio of the standard deviation over the range will be about

The most widely used measure of variability is the interquartile range.

The interquartile range is 0.25 times the range.

The most widely used measure of variability is the range.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

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 4: Exploring Data: Variability

The text uses a bimodal curve to show a mean and standard deviation on a single graph.

Data Set 4-5: 2, 4, 6, 8 -Refer to Data Set 4-5. If these scores were a sample from a larger population to which you wished to generalize, the standard deviation is

The best estimate of the population standard deviation, calculated from a sample is

If the standard deviation of a distribution is greater than one, the variance will be _______ than the standard deviation.

Choose the statement that is true, according to your text.

Find S using the definitional formula which has Σ(X−Xˉ)2\Sigma ( X - \bar { X } ) ^ { 2 }Σ(X−Xˉ)2 in the numerator. -Scores:4, 3, 1, 1, 1

a.Use the raw-score method to find the standard deviation of the two populations of scores below. 1 2 3 4 5 6 7 8 9 1 3 5 7 9 b. For the two distributions above, divide the range by the standard deviation. Explain the meaning of your result.

Which of the following is needed in calculating the interquartile range of a distribution?

Data Set 4-2: 5, 3, 9, 7, 6 -The raw score of 7 in Data Set 4-2 has a deviation score of

From the data given here compute: X 10 8 7 6 4 a. σ\sigmaσ by the deviation method. b. σ\sigmaσ by the raw-score method. c. S^\hat { S }S^ by the deviation method. d. S^\hat { S }S^ by the raw-score method. e. the range.

Find the range, IQR, and S^\hat { S }S^ X f 7 1 6 0 5 2 4 3 3 4 2

For a set of data, the ratio of the standard deviation over the range will be about

The most widely used measure of variability is the interquartile range.

The interquartile range is 0.25 times the range.

The most widely used measure of variability is the range.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

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

Find S using the definitional formula which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator. -Scores:4, 3, 1, 1, 1

From the data given here compute: X 10 8 7 6 4 a. $\sigma$ by the deviation method. b. $\sigma$ by the raw-score method. c. $\hat { S }$ by the deviation method. d. $\hat { S }$ by the raw-score method. e. the range.

Find the range, IQR, and $\hat { S }$ X f 7 1 6 0 5 2 4 3 3 4 2