Question 1

Which of the following actions will always change the value of the mean?

Accepted Answer

A) Changing the value of one score 
B) Adding a new score to the distribution 
C) Removing a score from the distribution 
D) All 3 of the other choices are correct 
A) Changing the value of one score 
B) Adding a new score to the distribution 
C) Removing a score from the distribution 
D) All 3 of the other choices are correct A

Question 2

For a perfectly symmetrical distribution,which relationship is always true?

Accepted Answer

A) Mean = median 
B) Mean = mode 
C) Median = mode 
D) Mean = median = mode 
A) Mean = median 
B) Mean = mode 
C) Median = mode 
D) Mean = median = mode A

Question 3

There are situations for which it is either impossible to compute a mean or the mean does not provide a central,representative value.

Accepted Answer

A) True 
 B)False  True

Question 4

What is the mean for the following scores? Scores: 4,6,14

Accepted Answer

A) 12 
B) 8 
C) 7 
D) 6 
A) 12 
B) 8 
C) 7 
D) 6

Question 5

A population of N = 10 scores has a mean of μ = 6.After one score is removed,the mean is found to be M = 5.What is the value of the score that was removed?

Accepted Answer

A) X = 10 
B) X = 5 
C) X = 3 
D) X = 15 
A) X = 10 
B) X = 5 
C) X = 3 
D) X = 15

Question 6

A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n = 15 students.However,one of the participants fails to solve the problems so the researcher has an undetermined score.What is the best measure of central tendency for these data?

Accepted Answer

A) The mean 
B) The median 
C) The mode 
D) Central tendency cannot be determined for these data 
A) The mean 
B) The median 
C) The mode 
D) Central tendency cannot be determined for these data

Question 7

It is possible for a distribution to have more than one mode.

Accepted Answer

A) True 
 B)False

Question 8

In a sample of n = 6 scores,the smallest score is X = 3,the largest score is X = 10,and the mean is M = 6.If the largest score is changed from X = 10 to X = 22,then what is the value of the new mean?

Accepted Answer

A) The mean is still M = 6 
B) The mean is M = 7 
C) The mean is M = 8 
D) Cannot be determined from the information given 
A) The mean is still M = 6 
B) The mean is M = 7 
C) The mean is M = 8 
D) Cannot be determined from the information given

Question 9

A sample has a mean of M = 90.If each score in the sample is multiplied by 5,then what is the mean for the new distribution?

Accepted Answer

A) 18 
B) 85 
C) 95 
D) 450 
A) 18 
B) 85 
C) 95 
D) 450

Question 10

A set of N = 8 scores has a mean of µ = 11.If 16 points are added to one of the scores,what is the new value for the population mean?

Accepted Answer

A) 10 
B) 11 
C) 12 
D) 13 
A) 10 
B) 11 
C) 12 
D) 13

Question 11

My electric bills for June,July,and August last summer were $75,$75,and $150,respectively.What was the mean amount for the three bills?

Accepted Answer

A) $75 
B) $100 
C) $125 
D) $150 
A) $75 
B) $100 
C) $125 
D) $150

Question 12

For a distribution with one or two extreme scores,the median is usually a more representative value than the mean.

Accepted Answer

A) True 
 B)False

Question 13

A sample has a mean of M = 40.If a new score of X = 35 is added to the sample,then the sample mean would increase.

Accepted Answer

A) True 
 B)False

Question 14

A sample of n = 7 scores has a mean of M = 11.If one score with a value of X = 5 is removed from the sample,what is the mean for the remaining scores?

Accepted Answer

The original sample had n = 7

Question 15

A population of n = 8 scores has ΣX = 40.What is the population mean?

Accepted Answer

A) 320 
B) 20 
C) 5 
D) 0.2 
A) 320 
B) 20 
C) 5 
D) 0.2

Question 16

A distribution of scores has a mean of 50,a median of 53,and a mode of 56.Based on this information,it appears that the distribution is negatively skewed.

Accepted Answer

A) True 
 B)False

Question 17

The mean is considered to be the "balance point" for a distribution because exactly half of the scores are located above the mean and exactly half are below the mean.

Accepted Answer

A) True 
 B)False

Question 18

What is the median for the following set of scores? Scores: 1,2,6,11,17

Accepted Answer

A) 4 
B) 6 
C) 8.5 
D) 8 
A) 4 
B) 6 
C) 8.5 
D) 8

Question 19

A sample has a mean of M = 40.If 10 points are added to one of the scores,what is the new value for the sample mean?

Accepted Answer

A) Still 40 
B) 41 
C) 50 
D) Cannot be determined from the information given 
A) Still 40 
B) 41 
C) 50 
D) Cannot be determined from the information given

Question 20

What is the preferred measure of central tendency for scores measured on an ordinal scale?

Accepted Answer

A) The mean 
B) The median 
C) The mode 
D) Central tendency cannot be determined for ordinal data 
A) The mean 
B) The median 
C) The mode 
D) Central tendency cannot be determined for ordinal data

Which of the following actions will always change the value of the mean?

For a perfectly symmetrical distribution,which relationship is always true?

There are situations for which it is either impossible to compute a mean or the mean does not provide a central,representative value.

What is the mean for the following scores? Scores: 4,6,14

A population of N = 10 scores has a mean of μ = 6.After one score is removed,the mean is found to be M = 5.What is the value of the score that was removed?

A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n = 15 students.However,one of the participants fails to solve the problems so the researcher has an undetermined score.What is the best measure of central tendency for these data?

It is possible for a distribution to have more than one mode.

In a sample of n = 6 scores,the smallest score is X = 3,the largest score is X = 10,and the mean is M = 6.If the largest score is changed from X = 10 to X = 22,then what is the value of the new mean?

A sample has a mean of M = 90.If each score in the sample is multiplied by 5,then what is the mean for the new distribution?

A set of N = 8 scores has a mean of µ = 11.If 16 points are added to one of the scores,what is the new value for the population mean?

My electric bills for June,July,and August last summer were $75,$75,and $150,respectively.What was the mean amount for the three bills?

For a distribution with one or two extreme scores,the median is usually a more representative value than the mean.

A sample has a mean of M = 40.If a new score of X = 35 is added to the sample,then the sample mean would increase.

A sample of n = 7 scores has a mean of M = 11.If one score with a value of X = 5 is removed from the sample,what is the mean for the remaining scores?

A population of n = 8 scores has ΣX = 40.What is the population mean?

A distribution of scores has a mean of 50,a median of 53,and a mode of 56.Based on this information,it appears that the distribution is negatively skewed.

The mean is considered to be the "balance point" for a distribution because exactly half of the scores are located above the mean and exactly half are below the mean.

What is the median for the following set of scores? Scores: 1,2,6,11,17

A sample has a mean of M = 40.If 10 points are added to one of the scores,what is the new value for the sample mean?

What is the preferred measure of central tendency for scores measured on an ordinal scale?

Introduction to Statistics

Frequency Distributions

Measures of Variability

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 3: Measures of Central Tendency

Which of the following actions will always change the value of the mean?

For a perfectly symmetrical distribution,which relationship is always true?

There are situations for which it is either impossible to compute a mean or the mean does not provide a central,representative value.

What is the mean for the following scores? Scores: 4,6,14

A population of N = 10 scores has a mean of μ = 6.After one score is removed,the mean is found to be M = 5.What is the value of the score that was removed?

A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n = 15 students.However,one of the participants fails to solve the problems so the researcher has an undetermined score.What is the best measure of central tendency for these data?

It is possible for a distribution to have more than one mode.

In a sample of n = 6 scores,the smallest score is X = 3,the largest score is X = 10,and the mean is M = 6.If the largest score is changed from X = 10 to X = 22,then what is the value of the new mean?

A sample has a mean of M = 90.If each score in the sample is multiplied by 5,then what is the mean for the new distribution?

A set of N = 8 scores has a mean of µ = 11.If 16 points are added to one of the scores,what is the new value for the population mean?

My electric bills for June,July,and August last summer were $75,$75,and $150,respectively.What was the mean amount for the three bills?

For a distribution with one or two extreme scores,the median is usually a more representative value than the mean.

A sample has a mean of M = 40.If a new score of X = 35 is added to the sample,then the sample mean would increase.

A sample of n = 7 scores has a mean of M = 11.If one score with a value of X = 5 is removed from the sample,what is the mean for the remaining scores?

A population of n = 8 scores has ΣX = 40.What is the population mean?

A distribution of scores has a mean of 50,a median of 53,and a mode of 56.Based on this information,it appears that the distribution is negatively skewed.

The mean is considered to be the "balance point" for a distribution because exactly half of the scores are located above the mean and exactly half are below the mean.

What is the median for the following set of scores? Scores: 1,2,6,11,17

A sample has a mean of M = 40.If 10 points are added to one of the scores,what is the new value for the sample mean?

What is the preferred measure of central tendency for scores measured on an ordinal scale?

Introduction to Statistics

Frequency Distributions

Measures of Variability

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