Question 1

For a population,a deviation score is computed as X - μ.

Accepted Answer

A) True 
 B)False

Question 2

A sample of n = 4 scores has ΣX = 8 and ΣX2 = 40.What is the value of SS for this sample?

Accepted Answer

A) 6 
B) 8 
C) 24 
D) 40 
A) 6 
B) 8 
C) 24 
D) 40

Question 3

Which of the following actions will have no effect on the value of the standard deviation?

Accepted Answer

A) Multiply each score in the distribution by 2 
B) Divide each score in the distribution by 2 
C) Subtract 5 points from every score in the distribution 
D) All of the other actions will change the value of the standard deviation 
A) Multiply each score in the distribution by 2 
B) Divide each score in the distribution by 2 
C) Subtract 5 points from every score in the distribution 
D) All of the other actions will change the value of the standard deviation

Question 4

What is the value of SS (sum of squared deviations)for the following population? Population: 1,1,1,5

Accepted Answer

A) 3 
B) 7 
C) 12 
D) 28 
A) 3 
B) 7 
C) 12 
D) 28

Question 5

Which of the following symbols identifies the population standard deviation?

Accepted Answer

A) s 
B) s2 
C) σ 
D) σ 2 
A) s 
B) s2 
C) σ 
D) σ 2

Question 6

A set of 10 scores has SS = 90.If the scores are a sample,the sample variance is ____,and if the scores are a population,the population variance is ____.

Accepted Answer

A) s2 = 9; σ2 = 9 
B) s2 = 9; σ2 = 10 
C) s2 = 10; σ2 = 9 
D) s2 = 10; σ2 = 10 
A) s2 = 9; σ2 = 9 
B) s2 = 9; σ2 = 10 
C) s2 = 10; σ2 = 9 
D) s2 = 10; σ2 = 10

Question 7

After a researcher multiplies every score in a sample by 2,the standard deviation is found to be s = 10.The original sample had a standard deviation of s = 5.

Accepted Answer

A) True 
 B)False

Question 8

For a population with F1F1F1S1F1F1F10 = 60,which of the following values for the population standard deviation would cause X = 68 to have the most extreme position in the distribution?

Accepted Answer

A) σ = 1 
B) σ = 2 
C) σ = 3 
D) σ = 4 
A) σ = 1 
B) σ = 2 
C) σ = 3 
D) σ = 4

Question 9

Compute SS,variance and standard deviation for the following population.Scores: 1,3,9,3

Accepted Answer

SS = 36,F1F1F1S1F1F

Question 10

A researcher takes a sample from a population and computes a statistic for the sample.Which of the following statements is correct?

Accepted Answer

A) If the sample statistic overestimates the corresponding population parameter,then the statistic is biased. 
B) If the sample statistic underestimates the corresponding population parameter,then the statistic is biased. 
C) If the sample statistic is equal to the corresponding population parameter,then the statistic is unbiased. 
D) None of the other statements is correct. 
A) If the sample statistic overestimates the corresponding population parameter,then the statistic is biased. 
B) If the sample statistic underestimates the corresponding population parameter,then the statistic is biased. 
C) If the sample statistic is equal to the corresponding population parameter,then the statistic is unbiased. 
D) None of the other statements is correct.

Question 11

A set of scores ranges from a high of X = 34 to a low of X = 24 and has a mean of 29.Which of the following is the most likely value for the standard deviation for these scores?

Accepted Answer

A) 2 points 
B) 5 points 
C) 10 points 
D) 34 points 
A) 2 points 
B) 5 points 
C) 10 points 
D) 34 points

Question 12

A sample of n = 5 scores has ΣX = 20 and ΣX2 = 120.For this sample,what is the value of SS?

Accepted Answer

A) 20 
B) 40 
C) 100 
D) 120 
A) 20 
B) 40 
C) 100 
D) 120

Question 13

For the following scores,which of the following actions will increase the range?

Accepted Answer

A) Subtract 3 points from the score X = 3 Scores: 3,7,10,15 
B) Subtract 3 points from the score X = 7 
C) Subtract 3 points from the score X = 10 
D) Subtract 3 points from the score X = 15 
A) Subtract 3 points from the score X = 3 Scores: 3,7,10,15 
B) Subtract 3 points from the score X = 7 
C) Subtract 3 points from the score X = 10 
D) Subtract 3 points from the score X = 15

Question 14

For a population of N = 4 scores with F1F1F1S1F1F1F10X = 10 and F1F1F1S1F1F1F10X2 = 30,SS = 5.

Accepted Answer

A) True 
 B)False

Question 15

A sample of n = 7 scores has SS = 42.The variance for this sample is s2 = 6.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is a consequence of increasing variability?

Accepted Answer

A) The distance from one score to another tends to increase,and a single score tends to provide a more accurate representation of the entire distribution. 
B) The distance from one score to another tends to increase,and a single score tends to provide a less accurate representation of the entire distribution. 
C) The distance from one score to another tends to decrease,and a single score tends to provide a more accurate representation of the entire distribution. 
D) The distance from one score to another tends to decrease,and a single score tends to provide a less accurate representation of the entire distribution. 
A) The distance from one score to another tends to increase,and a single score tends to provide a more accurate representation of the entire distribution. 
B) The distance from one score to another tends to increase,and a single score tends to provide a less accurate representation of the entire distribution. 
C) The distance from one score to another tends to decrease,and a single score tends to provide a more accurate representation of the entire distribution. 
D) The distance from one score to another tends to decrease,and a single score tends to provide a less accurate representation of the entire distribution.

Question 17

A population with SS = 90 and a variance of 9 has N = 10 scores.

Accepted Answer

A) True 
 B)False

Question 18

There is a 6-point difference between two sample means.If the two samples have the same variance,which of the following values would make the mean difference easiest to see in a graph showing the two distributions?

Accepted Answer

A) s2 = 2 
B) s2 = 8 
C) s2 = 16 
D) s2 = 64 
A) s2 = 2 
B) s2 = 8 
C) s2 = 16 
D) s2 = 64

Question 19

A sample of n = 6 scores has SS = 30 and s2 = 6.If the 6 scores were a population,the value of SS would still be 30,but the variance would be σ2 = 5.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following symbols identifies the sample variance?

Accepted Answer

A) s 
B) s2 
C) σ 
D) σ 2 
A) s 
B) s2 
C) σ 
D) σ 2

For a population,a deviation score is computed as X - μ.

A sample of n = 4 scores has ΣX = 8 and ΣX² = 40.What is the value of SS for this sample?

Which of the following actions will have no effect on the value of the standard deviation?

What is the value of SS (sum of squared deviations)for the following population? Population: 1,1,1,5

Which of the following symbols identifies the population standard deviation?

A set of 10 scores has SS = 90.If the scores are a sample,the sample variance is ,and if the scores are a population,the population variance is .

After a researcher multiplies every score in a sample by 2,the standard deviation is found to be s = 10.The original sample had a standard deviation of s = 5.

For a population with  = 60,which of the following values for the population standard deviation would cause X = 68 to have the most extreme position in the distribution?

Compute SS,variance and standard deviation for the following population.Scores: 1,3,9,3

A researcher takes a sample from a population and computes a statistic for the sample.Which of the following statements is correct?

A set of scores ranges from a high of X = 34 to a low of X = 24 and has a mean of 29.Which of the following is the most likely value for the standard deviation for these scores?

A sample of n = 5 scores has ΣX = 20 and ΣX² = 120.For this sample,what is the value of SS?

For the following scores,which of the following actions will increase the range?

For a population of N = 4 scores with X = 10 and X² = 30,SS = 5.

A sample of n = 7 scores has SS = 42.The variance for this sample is s² = 6.

Which of the following is a consequence of increasing variability?

A population with SS = 90 and a variance of 9 has N = 10 scores.

There is a 6-point difference between two sample means.If the two samples have the same variance,which of the following values would make the mean difference easiest to see in a graph showing the two distributions?

A sample of n = 6 scores has SS = 30 and s²= 6.If the 6 scores were a population,the value of SS would still be 30,but the variance would be σ²= 5.

Which of the following symbols identifies the sample variance?

Introduction to Statistics

Frequency Distributions

Measures of Central Tendency

Z-Scores

Probability

Probability and Samples:

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Anova

Correlation and Regression

Chi-Square Tests

Filters

Exam 4: Measures of Variability

For a population,a deviation score is computed as X - μ.

A sample of n = 4 scores has ΣX = 8 and ΣX2 = 40.What is the value of SS for this sample?

Which of the following actions will have no effect on the value of the standard deviation?

What is the value of SS (sum of squared deviations)for the following population? Population: 1,1,1,5

Which of the following symbols identifies the population standard deviation?

A set of 10 scores has SS = 90.If the scores are a sample,the sample variance is ____,and if the scores are a population,the population variance is ____.

After a researcher multiplies every score in a sample by 2,the standard deviation is found to be s = 10.The original sample had a standard deviation of s = 5.

For a population with  = 60,which of the following values for the population standard deviation would cause X = 68 to have the most extreme position in the distribution?

Compute SS,variance and standard deviation for the following population.Scores: 1,3,9,3

A researcher takes a sample from a population and computes a statistic for the sample.Which of the following statements is correct?

A set of scores ranges from a high of X = 34 to a low of X = 24 and has a mean of 29.Which of the following is the most likely value for the standard deviation for these scores?

A sample of n = 5 scores has ΣX = 20 and ΣX2 = 120.For this sample,what is the value of SS?

For the following scores,which of the following actions will increase the range?

For a population of N = 4 scores with X = 10 and X2 = 30,SS = 5.

A sample of n = 7 scores has SS = 42.The variance for this sample is s2 = 6.

Which of the following is a consequence of increasing variability?

A population with SS = 90 and a variance of 9 has N = 10 scores.

There is a 6-point difference between two sample means.If the two samples have the same variance,which of the following values would make the mean difference easiest to see in a graph showing the two distributions?

A sample of n = 6 scores has SS = 30 and s2 = 6.If the 6 scores were a population,the value of SS would still be 30,but the variance would be σ2 = 5.

Which of the following symbols identifies the sample variance?

Introduction to Statistics

Frequency Distributions

Measures of Central Tendency

Z-Scores

Probability

Probability and Samples:

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

The T Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Anova

Correlation and Regression

Chi-Square Tests

Filters

A sample of n = 4 scores has ΣX = 8 and ΣX² = 40.What is the value of SS for this sample?

A set of 10 scores has SS = 90.If the scores are a sample,the sample variance is ,and if the scores are a population,the population variance is .

A sample of n = 5 scores has ΣX = 20 and ΣX² = 120.For this sample,what is the value of SS?

For a population of N = 4 scores with X = 10 and X² = 30,SS = 5.

A sample of n = 7 scores has SS = 42.The variance for this sample is s² = 6.

A sample of n = 6 scores has SS = 30 and s²= 6.If the 6 scores were a population,the value of SS would still be 30,but the variance would be σ²= 5.