Question 1

Which of the following is true for most distributions?

Accepted Answer

A)  Around 30% of the scores will be located within one standard deviation of the mean.
B)  Around 50% of the scores will be located within one standard deviation of the mean.
C)  Around 70% of the scores will be located within one standard deviation of the mean.
D)  Around 90% of the scores will be located within one standard deviation of the mean.

Question 2

For a sample with M = 40 and s = 4,about 95% of the individuals will have scores between X = 32 and X = 48.

Accepted Answer

A) True 
 B)False

Question 3

Under what circumstances is the computational formula preferred over the definitional formula when computing SS,the sum of the squared deviations,for a sample?

Accepted Answer

A)  When the sample mean is a whole number
B)  When the sample mean is not a whole number
C)  When the sample variance is a whole number
D)  When the sample variance is not a whole number

Question 4

All the possible samples of n = 3 scores are selected from a population with  = 30 and  = 5 and the mean is computed for each of the samples.If the average is calculated for all of the sample means,what value will be obtained?

Accepted Answer

A)  30
B)  Greater than 30
C)  Less than 30
D)  Impossible to predict

Question 5

A population has µ = 50 and σ = 5.If 10 points are added to every score in the population,what are the new values for the mean and standard deviation?

Accepted Answer

A)  µ = 50 and σ = 5
B)  µ = 50 and σ = 15
C)  µ = 60 and σ = 5
D)  µ = 60 and σ = 15

Question 6

A sample consists of n = 16 scores.How many of the scores are used to calculate the range?

Accepted Answer

A)  2
B)  4
C)  8
D)  All 16

Question 7

Using the definitional formula,compute SS for the following population and then find the population variance and the standard deviation.Scores: 9,4,0,6,1,4

Accepted Answer

SS = 54,<font face="symbol">F1F...

Question 8

If the highest score in a distribution is X = 16 and the lowest is X = 4,then the range is 12 or 13 points.

Accepted Answer

A) True 
 B)False

Question 9

In a population of N = 10 scores,the smallest score is X = 8 and the largest is X = 20.What is the range for this population?

Accepted Answer

A)  8
B)  10
C)  12-13
D)  20

Question 10

A sample with a variance of 25 has a standard deviation equal to 5 points.

Accepted Answer

A) True 
 B)False

Question 11

The sum of the squared deviation scores is SS = 20 for a sample of n = 5 scores.What is the variance for this sample?

Accepted Answer

A)  4
B)  5
C)  80
D)  100

Question 12

A population of N = 6 scores has ΣX = 12 and ΣX2 = 54.What is the value of SS for this population?

Accepted Answer

A)  5
B)  9
C)  30
D)  54

Question 13

Which set of scores has the smallest standard deviation?

Accepted Answer

A)  11,17,31,53
B)  5,11,42,22
C)  145,143,145,147
D)  27,105,10,80

Question 14

A population has SS = 100 and 2 = 4.How many scores are in the population?

Accepted Answer

A)  25
B)  26
C)  200
D)  400

Question 15

Under what circumstances would a score that is 10 points below the mean be considered to be an extreme value?

Accepted Answer

A)  When the mean is much greater than 10
B)  When the mean is much less than 10
C)  When the standard deviation is much greater than 10
D)  When the standard deviation is much less than 10

Question 16

If the scores in a population range from a low of X = 5 to a high of X = 14,then the population standard deviation must be less than 10 points.

Accepted Answer

A) True 
 B)False

Question 17

For a sample with M = 20 and s = 4,a score of X = 17 would be considered an extremely low score.

Accepted Answer

A) True 
 B)False

Question 18

The value for SS can never be less than zero.

Accepted Answer

A) True 
 B)False

Question 19

If a sample of n = 6 scores has F1F1F1S1F1F1F10X = 30 and F1F1F1S1F1F1F10X2 = 200,then SS = 20.

Accepted Answer

A) True 
 B)False

Question 20

The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores.What is the variance for this population?

Accepted Answer

A)  4
B)  5
C)  80
D)  100

Exam 4: Measures of Variability

The sum of the squared deviation scores is SS = 20 for a sample of n = 5 scores.What is the variance for this sample?

Correct AnswerverifiedShow Answer

Under what circumstances would a score that is 10 points below the mean be considered to be an extreme value?

Correct AnswerverifiedShow Answer

Under what circumstances is the computational formula preferred over the definitional formula when computing SS,the sum of the squared deviations,for a sample?

Correct AnswerverifiedShow Answer

In a population of N = 10 scores,the smallest score is X = 8 and the largest is X = 20.What is the range for this population?

Correct AnswerverifiedShow Answer

A sample consists of n = 16 scores.How many of the scores are used to calculate the range?

Correct AnswerverifiedShow Answer

A sample with a variance of 25 has a standard deviation equal to 5 points.

Correct AnswerverifiedShow Answer

For a sample with M = 40 and s = 4,about 95% of the individuals will have scores between X = 32 and X = 48.

Correct AnswerverifiedShow Answer

If the scores in a population range from a low of X = 5 to a high of X = 14,then the population standard deviation must be less than 10 points.

Correct AnswerverifiedShow Answer

Using the definitional formula,compute SS for the following population and then find the population variance and the standard deviation.Scores: 9,4,0,6,1,4

Correct AnswerverifiedSS = 54,F1F...View AnswerShow Answer

The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores.What is the variance for this population?

Correct AnswerverifiedShow Answer

A population has µ = 50 and σ = 5.If 10 points are added to every score in the population,what are the new values for the mean and standard deviation?

Correct AnswerverifiedShow Answer

A population of N = 6 scores has ΣX = 12 and ΣX2 = 54.What is the value of SS for this population?

Correct AnswerverifiedShow Answer

The value for SS can never be less than zero.

Correct AnswerverifiedShow Answer

For a sample with M = 20 and s = 4,a score of X = 17 would be considered an extremely low score.

Correct AnswerverifiedShow Answer

If the highest score in a distribution is X = 16 and the lowest is X = 4,then the range is 12 or 13 points.

Correct AnswerverifiedShow Answer

All the possible samples of n = 3 scores are selected from a population with  = 30 and  = 5 and the mean is computed for each of the samples.If the average is calculated for all of the sample means,what value will be obtained?

Correct AnswerverifiedShow Answer

If a sample of n = 6 scores has X = 30 and X2 = 200,then SS = 20.

Correct AnswerverifiedShow Answer

A population has SS = 100 and 2 = 4.How many scores are in the population?

Correct AnswerverifiedShow Answer

Which set of scores has the smallest standard deviation?

Correct AnswerverifiedShow Answer

Which of the following is true for most distributions?

Correct AnswerverifiedShow Answer

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SS = 54,F1F...
View Answer

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A population of N = 6 scores has ΣX = 12 and ΣX² = 54.What is the value of SS for this population?

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If a sample of n = 6 scores has X = 30 and X² = 200,then SS = 20.

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A population has SS = 100 and ² = 4.How many scores are in the population?

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