Question 1

The interquartile range always

Accepted Answer

A)  is one-fourth of the range 
B)  becomes larger if more observations are added 
C)  contains 50 percent of the frequencies 
D)  all of the other alternatives are correct. 
A)  is one-fourth of the range 
B)  becomes larger if more observations are added 
C)  contains 50 percent of the frequencies 
D)  all of the other alternatives are correct.

Question 2

Data Set 4-3: -2, -1, 0, 2, 6
-Refer to Data Set 4-3. The standard deviation S is

Accepted Answer

A)  2.58 
B)  2.83 
C)  6.67 
D)  none of the above 
A)  2.58 
B)  2.83 
C)  6.67 
D)  none of the above

Question 3

An investigator wanted an estimate of the variance of a population. She drew a sample. Her last step would be to calculate

Accepted Answer

A) $\sigma$ 
B)  $\sigma$2 
C)  $\hat { S }$ 
D)  $\hat{ S }$ 2. 
A) $\sigma$ 
B)  $\sigma$2 
C)  $\hat { S }$ 
D)  $\hat{ S }$ 2.

Question 4

From all the employees in a company, a small group was selected to participate in a study of employee satisfaction. The results of the study were to be used to make decisions about all the employees of the company. On one measure the following summary numbers were obtained: $\Sigma$X= 30, $\Sigma$X2 = 350, N = 12. Calculate the appropriate standard deviation.

Accepted Answer

A)  22.92 
B)  4.79 
C)  5.00 
D)  None of the other alternatives are correct. 
A)  22.92 
B)  4.79 
C)  5.00 
D)  None of the other alternatives are correct.

Question 5

Compute the range, $\hat{ S }$ , and $\sigma$ for the numbers below. Use the raw-score method for $\hat { S }$ and $\sigma$.1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9

Accepted Answer

None

Question 6

Two distributions that have the same mean must have the same

Accepted Answer

A)  range 
B)  standard deviation 
C)  variance 
D)  none of the other alternatives are correct. 
A)  range 
B)  standard deviation 
C)  variance 
D)  none of the other alternatives are correct.

Question 7

For the scores: -2, 0, 2, 5, the range is

Accepted Answer

A)  a negative number 
B)  6 
C)  4 
D)  none of the other alternatives are correct. 
A)  a negative number 
B)  6 
C)  4 
D)  none of the other alternatives are correct.

Question 8

A sample of ten, which was part of a larger group the investigator was interested in, produced the following statistics: $\Sigma$X= 20; $\Sigma$X2 = 121. The standard deviation is

Accepted Answer

A)  2.85 
B)  3.00 
C)  8.10 
D)  9.00. 
A)  2.85 
B)  3.00 
C)  8.10 
D)  9.00.

Question 9

Find $\hat { S }$ using the definitional formula, which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator.
-Scores: 7, 4, 3, 2

Accepted Answer

The answer of Find $\hat { S }$ using the...

Question 10

From all the employees in a company, a small group was selected to participate in a study of employee satisfaction. The results of the study were to be generalized to all the employees of the company. To find the variability in satisfaction, the investigator should compute

Accepted Answer

A)  $\bar { X }$ 
B)  S 
C)  $\hat { S }$ 
D)  $\sigma$. 
A)  $\bar { X }$ 
B)  S 
C)  $\hat { S }$ 
D)  $\sigma$.

Question 11

The formula for the standard deviation of a population has N in the denominator.

Accepted Answer

A) True 
 B)False

Question 12

The range is the distance between the two extreme scores.

Accepted Answer

A) True 
 B)False

Question 13

To calculate a variance of a distribution, double the standard deviation of the distribution.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following distribution of scores is the most variable?

Accepted Answer

A)  1, 2, 3 
B)  8, 9, 10 
C)  1, 3, 5 
D)  all of the other alternatives are equally variable. 
A)  1, 2, 3 
B)  8, 9, 10 
C)  1, 3, 5 
D)  all of the other alternatives are equally variable.

Question 15

Suppose you had a sample and you wanted to draw conclusions about the variability of a population. You should calculate

Accepted Answer

A)  $\hat { S }$ 
B)  S 
C)  deviation scores 
D)  the range. 
A)  $\hat { S }$ 
B)  S 
C)  deviation scores 
D)  the range.

Question 16

When a standard deviation is squared, you get a number that is

Accepted Answer

A)  twice as big 
B)  called the variance 
C)  both twice as big and called the variance 
D)  neither twice as big, nor called the variance. 
A)  twice as big 
B)  called the variance 
C)  both twice as big and called the variance 
D)  neither twice as big, nor called the variance.

Question 17

Which of the following distributions of scores is the least variable?

Accepted Answer

A)  0, 1, 2 
B)  -2, 0, 2 
C)  1, 2, 2 
D)  all of the other alternatives are equally variable. 
A)  0, 1, 2 
B)  -2, 0, 2 
C)  1, 2, 2 
D)  all of the other alternatives are equally variable.

Question 18

Find $\hat { S }$ using the definitional formula, which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator.
-Scores: 9, 7, 4, 4, 1

Accepted Answer

The answer of Find $\hat { S }$ using the...

Question 19

The officer in charge of personnel was trying to choose an operator for a radar scope. The task was to detect enemy aircraft and sound the alarm; this requires sustained vigilance. Some selection had already been accomplished and of the three remaining recruits the most reliable was to be chosen as operator. In a sample of their proficiency the following reaction times were found. Calculate statistics that will allow you to choose the most consistent candidate. Scores are in seconds. $$\begin{array} { c c c } 
\text { Candidate A } & \text { Candidate B } & \text { Candidate C } \
\hline 1.4 & 1.9 & 1.5 \
2.6 & 2.7 & 3.0 \
1.7 & 1.3 & 2.7 \
3.4 & 2.7 & 2.6 \
2.6 & 3.1 & 1.9
\end{array}$$

Accepted Answer

The candidate with the smallest standard

Question 20

Data Set 4-2: 5, 3, 9, 7, 6
-Referring to Data Set 4-2, the range is

Accepted Answer

A)  2 
B)  5 
C)  6 
D)  7. 
A)  2 
B)  5 
C)  6 
D)  7.

The interquartile range always

Data Set 4-3: -2, -1, 0, 2, 6 -Refer to Data Set 4-3. The standard deviation S is

An investigator wanted an estimate of the variance of a population. She drew a sample. Her last step would be to calculate

Compute the range, $\hat{ S }$ , and $\sigma$ for the numbers below. Use the raw-score method for $\hat { S }$ and $\sigma$ .1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9

Two distributions that have the same mean must have the same

For the scores: -2, 0, 2, 5, the range is

A sample of ten, which was part of a larger group the investigator was interested in, produced the following statistics: $\Sigma$ X= 20; $\Sigma$ X² = 121. The standard deviation is

Find $\hat { S }$ using the definitional formula, which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator. -Scores: 7, 4, 3, 2

From all the employees in a company, a small group was selected to participate in a study of employee satisfaction. The results of the study were to be generalized to all the employees of the company. To find the variability in satisfaction, the investigator should compute

The formula for the standard deviation of a population has N in the denominator.

The range is the distance between the two extreme scores.

To calculate a variance of a distribution, double the standard deviation of the distribution.

Which of the following distribution of scores is the most variable?

Suppose you had a sample and you wanted to draw conclusions about the variability of a population. You should calculate

When a standard deviation is squared, you get a number that is

Which of the following distributions of scores is the least variable?

Find $\hat { S }$ using the definitional formula, which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator. -Scores: 9, 7, 4, 4, 1

Data Set 4-2: 5, 3, 9, 7, 6 -Referring to Data Set 4-2, the range is

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 interquartile range always

Data Set 4-3: -2, -1, 0, 2, 6 -Refer to Data Set 4-3. The standard deviation S is

An investigator wanted an estimate of the variance of a population. She drew a sample. Her last step would be to calculate

Compute the range, S^\hat{ S }S^ , and σ\sigmaσ for the numbers below. Use the raw-score method for S^\hat { S }S^ and σ\sigmaσ .1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9

Two distributions that have the same mean must have the same

For the scores: -2, 0, 2, 5, the range is

A sample of ten, which was part of a larger group the investigator was interested in, produced the following statistics: Σ\SigmaΣ X= 20; Σ\SigmaΣ X2 = 121. The standard deviation is

Find S^\hat { S }S^ using the definitional formula, which has Σ(X−Xˉ)2\Sigma ( X - \bar { X } ) ^ { 2 }Σ(X−Xˉ)2 in the numerator. -Scores: 7, 4, 3, 2

From all the employees in a company, a small group was selected to participate in a study of employee satisfaction. The results of the study were to be generalized to all the employees of the company. To find the variability in satisfaction, the investigator should compute

The formula for the standard deviation of a population has N in the denominator.

The range is the distance between the two extreme scores.

To calculate a variance of a distribution, double the standard deviation of the distribution.

Which of the following distribution of scores is the most variable?

Suppose you had a sample and you wanted to draw conclusions about the variability of a population. You should calculate

When a standard deviation is squared, you get a number that is

Which of the following distributions of scores is the least variable?

Find S^\hat { S }S^ using the definitional formula, which has Σ(X−Xˉ)2\Sigma ( X - \bar { X } ) ^ { 2 }Σ(X−Xˉ)2 in the numerator. -Scores: 9, 7, 4, 4, 1

Data Set 4-2: 5, 3, 9, 7, 6 -Referring to Data Set 4-2, the range is

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

Compute the range, $\hat{ S }$ , and $\sigma$ for the numbers below. Use the raw-score method for $\hat { S }$ and $\sigma$ .1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9

A sample of ten, which was part of a larger group the investigator was interested in, produced the following statistics: $\Sigma$ X= 20; $\Sigma$ X² = 121. The standard deviation is

Find $\hat { S }$ using the definitional formula, which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator. -Scores: 7, 4, 3, 2

Find $\hat { S }$ using the definitional formula, which has $\Sigma ( X - \bar { X } ) ^ { 2 }$ in the numerator. -Scores: 9, 7, 4, 4, 1