Question 1

Data Set 4-6: -1, 3, 0, 2, 1
-Referring to Data Set 4-6, the range is

Accepted Answer

A)  5 
B)  4 
C)  3 
D)  none of the other alternatives are correct. 
A)  5 
B)  4 
C)  3 
D)  none of the other alternatives are correct.

Question 2

The formula for the standard deviation of a sample used to estimate ? has N in the denominator.

Accepted Answer

A) True 
 B)False

Question 3

The supervisor had to select a new aircraft controller (who watches planes on radar and gives instructions). The task requires sustained vigilance. Some selection had already been accomplished and of the three remaining applicants the most reliable was to be chosen. In a sample of their proficiency, the following reaction times were found. Calculate statistics that allow you to choose the most consistent applicant. Scores are in seconds. $$\begin{array} { c c c } 
\text { Applicant A } & \text { Applicant B } & \text { Applicant C } \
\hline 1.4 & 1.3 & 1.5 \
2.6 & 2.7 & 2.5 \
1.7 & 1.6 & 1.8 \
3.4 & 3.5 & 3.3
\end{array}$$

Accepted Answer

The applicant with the smallest standard

Question 4

"Yippie,"yelled Yerkes, the mad genealogist, "I now have birth weight data of every Yerkes ever born. I am the last of the Yerkes, and I am sterile. Now, you can calculate the appropriate birth weight standard deviation of the Yerkes for me!"Given the data: $\Sigma$X = 70, $\Sigma$X 2=499,N=10, what is that standard deviation?

Accepted Answer

A)  0.90 
B)  0.95 
C)  1.00 
D)  none of the other alternatives are correct. 
A)  0.90 
B)  0.95 
C)  1.00 
D)  none of the other alternatives are correct.

Question 5

Which of the following contains an expression of variability about Joe?

Accepted Answer

A)  "Joe is solid as a rock you can count on him." 
B)  "For his dental appointments, Joe is always late." 
C)  "Sometimes Joe's ideas are great and sometimes they're off the wall." 
D)  "He's absolutely the most undisciplined person on the staff." 
A)  "Joe is solid as a rock you can count on him." 
B)  "For his dental appointments, Joe is always late." 
C)  "Sometimes Joe's ideas are great and sometimes they're off the wall." 
D)  "He's absolutely the most undisciplined person on the staff."

Question 6

The range is the distance between the two extreme scores divided by 2.

Accepted Answer

A) True 
 B)False

Question 7

The statistic that is used to estimate $\sigma$ is

Accepted Answer

A)  $\hat { S }$ 
B)  S 
C)  $\Sigma$ X/N 
D)  none of the other alternatives are correct. 
A)  $\hat { S }$ 
B)  S 
C)  $\Sigma$ X/N 
D)  none of the other alternatives are correct.

Question 8

Calculating a deviation score requires a standard deviation.

Accepted Answer

A) True 
 B)False

Question 9

Jason was faced with a decision. All his old chain saws were worn out; he needed a new supply for his next 13 movies. He took bids from three manufacturers for 100 chain saws and all three quoted him a unit price of $304.25. Young Jason, who was no dummy, wanted the best quality. He decided that quality could be measured by a standard deviation. His reasoning was that careful manufacturing produces a batch of parts that are practically identical; sloppy manufacturing produces a batch that is quite variable. If he focused on a representative part (the sprocket) and measured (in millimeters) five of them from each manufacturer, he could produce an objective measure of quality that could be applied to the decision on the 100 saws he needed. Give poor Jason some help. From the data below, calculate that measure and write a sentence or paragraph that explains why you recommend a particular saw. $$\begin{array} { l c c c c c } 
&{ \text { Sprockets } } \
& 1 & 2 & 3 & 4 & 5 \
\text { McCulloch } & 25.0 & 25.7 & 25.9 & 25.3 & 25.5 \
\text { Stihl } & 30.7 & 31.4 & 30.9 & 31.0 & 30.9 \
\text { Husqvarna } & 34.8 & 35.0 & 35.2 & 34.9 & 35.0
\end{array}$$

Accepted Answer

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

Question 10

Which of the following may be a negative number?

Accepted Answer

A)  range 
B)  variance 
C)  deviation score 
D)  standard deviation. 
A)  range 
B)  variance 
C)  deviation score 
D)  standard deviation.

Question 11

If the standard deviation of a distribution is less 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 12

Data Set 4-6: -1, 3, 0, 2, 1
-In Data Set 4-6 the score of 0 has a deviation score of

Accepted Answer

A)  0 
B)  1 
C)  - 1 
D)  5. 
A)  0 
B)  1 
C)  - 1 
D)  5.

Question 13

If the variance of a distribution is an integer (other than one or zero), the standard deviation will be _______ than the variance.

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 14

$X - \bar { X }$ is

Accepted Answer

A)  the range 
B)  a deviation score 
C)  the standard deviation 
D)  the variance. 
A)  the range 
B)  a deviation score 
C)  the standard deviation 
D)  the variance.

Question 15

Data Set 4-8: 2, -2, 4, 6
-For Data Set 4-8, a raw score of zero would have a deviation score of

Accepted Answer

A)  0 
B)  -3.5 
C)  -2.5 
D)  -0.85. 
A)  0 
B)  -3.5 
C)  -2.5 
D)  -0.85.

Question 16

Data Set 4-8: 2, -2, 4, 6
-Using Data Set 4-8 as a sample, estimate the population.

Accepted Answer

A)  1.66 
B)  2.96 
C)  3.42 
A)  1.66 
B)  2.96 
C)  3.42

Question 17

Data Set 4-6: -1, 3, 0, 2, 1
-Which of the following distributions of scores is less variable than Data Set 4-6? (You should be able to answer by just by eyeballing the numbers.)

Accepted Answer

A)  3, -2, -2, -1, 0 
B)  0, -3, 3, 2, -2 
C)  2, 4, 6, 8, 10 
D)  none of the other alternatives are correct. 
A)  3, -2, -2, -1, 0 
B)  0, -3, 3, 2, -2 
C)  2, 4, 6, 8, 10 
D)  none of the other alternatives are correct.

Question 18

Which of the following is false?

Accepted Answer

A)  $\hat{ S }$ is used to estimate $\sigma$. 
B)  $\hat { S }$ uses N - 1 in the denominator 
C)  $\hat { S }$ < $\sigma$ when both are calculated on the same numbers 
D)  $\hat{ S }$ is based on a sample. 
A)  $\hat{ S }$ is used to estimate $\sigma$. 
B)  $\hat { S }$ uses N - 1 in the denominator 
C)  $\hat { S }$ < $\sigma$ when both are calculated on the same numbers 
D)  $\hat{ S }$ is based on a sample.

Question 19

The statistic that is an estimate of $\sigma$2 is

Accepted Answer

A)  $\Sigma$X2 
B)  ($\Sigma$X)2 
C)  $\hat { S }$ 
D)  none of the other alternatives are correct. 
A)  $\Sigma$X2 
B)  ($\Sigma$X)2 
C)  $\hat { S }$ 
D)  none of the other alternatives are correct.

Question 20

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

Accepted Answer

A)  6 
B)  7 
C)  8 
D)  9. 
A)  6 
B)  7 
C)  8 
D)  9.

Data Set 4-6: -1, 3, 0, 2, 1 -Referring to Data Set 4-6, the range is

The formula for the standard deviation of a sample used to estimate ? has N in the denominator.

Which of the following contains an expression of variability about Joe?

The range is the distance between the two extreme scores divided by 2.

The statistic that is used to estimate $\sigma$ is

Calculating a deviation score requires a standard deviation.

Which of the following may be a negative number?

If the standard deviation of a distribution is less than one, the variance will be ________ than the standard deviation.

Data Set 4-6: -1, 3, 0, 2, 1 -In Data Set 4-6 the score of 0 has a deviation score of

If the variance of a distribution is an integer (other than one or zero), the standard deviation will be _______ than the variance.

$X - \bar { X }$ is

Data Set 4-8: 2, -2, 4, 6 -For Data Set 4-8, a raw score of zero would have a deviation score of

Data Set 4-8: 2, -2, 4, 6 -Using Data Set 4-8 as a sample, estimate the population.

Data Set 4-6: -1, 3, 0, 2, 1 -Which of the following distributions of scores is less variable than Data Set 4-6? (You should be able to answer by just by eyeballing the numbers.)

Which of the following is false?

The statistic that is an estimate of $\sigma$ ²is

Data Set 4-3: -2, -1, 0, 2, 6 -Refer to Data Set 4-3. 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

Data Set 4-6: -1, 3, 0, 2, 1 -Referring to Data Set 4-6, the range is

The formula for the standard deviation of a sample used to estimate ? has N in the denominator.

Which of the following contains an expression of variability about Joe?

The range is the distance between the two extreme scores divided by 2.

The statistic that is used to estimate σ\sigmaσ is

Calculating a deviation score requires a standard deviation.

Which of the following may be a negative number?

If the standard deviation of a distribution is less than one, the variance will be ________ than the standard deviation.

Data Set 4-6: -1, 3, 0, 2, 1 -In Data Set 4-6 the score of 0 has a deviation score of

If the variance of a distribution is an integer (other than one or zero), the standard deviation will be _______ than the variance.

X−XˉX - \bar { X }X−Xˉ is

Data Set 4-8: 2, -2, 4, 6 -For Data Set 4-8, a raw score of zero would have a deviation score of

Data Set 4-8: 2, -2, 4, 6 -Using Data Set 4-8 as a sample, estimate the population.

Data Set 4-6: -1, 3, 0, 2, 1 -Which of the following distributions of scores is less variable than Data Set 4-6? (You should be able to answer by just by eyeballing the numbers.)

Which of the following is false?

The statistic that is an estimate of σ\sigmaσ 2 is

Data Set 4-3: -2, -1, 0, 2, 6 -Refer to Data Set 4-3. 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

The statistic that is used to estimate $\sigma$ is

$X - \bar { X }$ is

The statistic that is an estimate of $\sigma$ ²is