Question 1

For the scores in the following frequency distribution table,the mean is M = 3.
 $$\begin{array} { l l } 
X & f \
\hline 4 & 1 \
3 & 4 \
2 & 2
\end{array}$$

Accepted Answer

A) True 
 B)False  False

Question 2

A sample of n = 5 scores has a mean of M = 12.One new score is added to the sample,and the new mean is calculated to be M = 11.What is the value of new score?

Accepted Answer

A) X = 5 
B) X = 6 
C) X = 12 
D) X = 60 
A) X = 5 
B) X = 6 
C) X = 12 
D) X = 60 B

Question 3

For a perfectly symmetrical distribution with µ = 30,what is the mode?

Accepted Answer

A) 30 
B) Greater than 30 
C) Less than 30 
D) Cannot be determined from the information given 
A) 30 
B) Greater than 30 
C) Less than 30 
D) Cannot be determined from the information given D

Question 4

A sample of n = 10 scores has a mean of 50.A second sample has n = 5 scores and M = 60.If the two samples are combined,the combined sample mean will be greater than 55.

Accepted Answer

A) True 
 B)False

Question 5

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 6

Explain why it is necessary to have more than one standard procedure for defining and measuring central tendency.

Accepted Answer

No single method for measuring central t

Question 7

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 8

A sample of n = 8 scores has a mean of M = 20.After one score is removed from the sample,the mean is calculated to be M = 23.The removed score must have a value greater than 20.

Accepted Answer

A) True 
 B)False

Question 9

A sample has a mean of M = 86.If one new person is added to the sample,what effect will it have on the sample mean?

Accepted Answer

A) The sample mean will increase. 
B) The sample mean will decrease. 
C) The sample mean will remain the same. 
D) Cannot be determined from the information given 
A) The sample mean will increase. 
B) The sample mean will decrease. 
C) The sample mean will remain the same. 
D) Cannot be determined from the information given

Question 10

A sample has n = 5 scores: 2,4,5,8,and 11.The median for the sample is 6.5.

Accepted Answer

A) True 
 B)False

Question 11

A population of scores has a mean of µ = 26,a median of 23,and a mode of 22.What is the most likely shape for the population distribution?

Accepted Answer

A) Symmetrical 
B) Positively skewed 
C) Negatively skewed 
D) Cannot be determined from the information given 
A) Symmetrical 
B) Positively skewed 
C) Negatively skewed 
D) Cannot be determined from the information given

Question 12

Changing the value of a score in a distribution will always change the value of the mean.

Accepted Answer

A) True 
 B)False

Question 13

Find the mean,the median,and the mode for the set of scores in the frequency distribution histogram below.

Accepted Answer

Mean = 33/

Question 14

A population has a mean of µ = 30.If 3 points are added to each score,what is the mean for the new distribution?

Accepted Answer

A) 27 
B) 30 
C) 33 
D) Cannot be determined from the information given 
A) 27 
B) 30 
C) 33 
D) Cannot be determined from the information given

Question 15

A sample of n = 6 scores has a mean of M = 9.If one individual with a score of X = 4 is removed from the sample,the new mean will be M = 10.

Accepted Answer

A) True 
 B)False

Question 16

For a positively skewed distribution,the mean usually has a larger value than either the median or the mode.

Accepted Answer

A) True 
 B)False

Question 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

Under what circumstances is the median likely to produce a better measure of central tendency than the mean?

Accepted Answer

A) With a symmetrical distribution 
B) With an extremely skewed distribution 
C) When the data consist of nominal measurements 
D) When the data are numerical scores from an interval or a ratio scale 
A) With a symmetrical distribution 
B) With an extremely skewed distribution 
C) When the data consist of nominal measurements 
D) When the data are numerical scores from an interval or a ratio scale

Question 20

What is the mean for the population of scores shown in the frequency distribution table? $$\begin{array} { l l } 
\ X  & \mathrm { f } \
\hline 5 & 1 \
4 & 2 \
3 & 3 \
2 & 4 \
1 & 2
\end{array}$$

Accepted Answer

A) 15/5 = 3 
B) 15/12 = 1.25 
C) 32/5 = 6.60 
D) 32/12 = 2.67 
A) 15/5 = 3 
B) 15/12 = 1.25 
C) 32/5 = 6.60 
D) 32/12 = 2.67

For the scores in the following frequency distribution table,the mean is M = 3. X f 4 1 3 4 2 2

A sample of n = 5 scores has a mean of M = 12.One new score is added to the sample,and the new mean is calculated to be M = 11.What is the value of new score?

For a perfectly symmetrical distribution with µ = 30,what is the mode?

A sample of n = 10 scores has a mean of 50.A second sample has n = 5 scores and M = 60.If the two samples are combined,the combined sample mean will be greater than 55.

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.

Explain why it is necessary to have more than one standard procedure for defining and measuring central tendency.

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 of n = 8 scores has a mean of M = 20.After one score is removed from the sample,the mean is calculated to be M = 23.The removed score must have a value greater than 20.

A sample has a mean of M = 86.If one new person is added to the sample,what effect will it have on the sample mean?

A sample has n = 5 scores: 2,4,5,8,and 11.The median for the sample is 6.5.

A population of scores has a mean of µ = 26,a median of 23,and a mode of 22.What is the most likely shape for the population distribution?

Changing the value of a score in a distribution will always change the value of the mean.

Find the mean,the median,and the mode for the set of scores in the frequency distribution histogram below.

A population has a mean of µ = 30.If 3 points are added to each score,what is the mean for the new distribution?

A sample of n = 6 scores has a mean of M = 9.If one individual with a score of X = 4 is removed from the sample,the new mean will be M = 10.

For a positively skewed distribution,the mean usually has a larger value than either the median or the mode.

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

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

Under what circumstances is the median likely to produce a better measure of central tendency than the mean?

What is the mean for the population of scores shown in the frequency distribution table? \ X 5 1 4 2 3 3 2 4 1 2

Introduction to Statistics.

Frequency Distributions.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: The Distribution of Sample Means.

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 Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

Filters

Exam 3: Central Tendency.

For the scores in the following frequency distribution table,the mean is M = 3. X f 4 1 3 4 2 2

A sample of n = 5 scores has a mean of M = 12.One new score is added to the sample,and the new mean is calculated to be M = 11.What is the value of new score?

For a perfectly symmetrical distribution with µ = 30,what is the mode?

A sample of n = 10 scores has a mean of 50.A second sample has n = 5 scores and M = 60.If the two samples are combined,the combined sample mean will be greater than 55.

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.

Explain why it is necessary to have more than one standard procedure for defining and measuring central tendency.

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 of n = 8 scores has a mean of M = 20.After one score is removed from the sample,the mean is calculated to be M = 23.The removed score must have a value greater than 20.

A sample has a mean of M = 86.If one new person is added to the sample,what effect will it have on the sample mean?

A sample has n = 5 scores: 2,4,5,8,and 11.The median for the sample is 6.5.

A population of scores has a mean of µ = 26,a median of 23,and a mode of 22.What is the most likely shape for the population distribution?

Changing the value of a score in a distribution will always change the value of the mean.

Find the mean,the median,and the mode for the set of scores in the frequency distribution histogram below.

A population has a mean of µ = 30.If 3 points are added to each score,what is the mean for the new distribution?

A sample of n = 6 scores has a mean of M = 9.If one individual with a score of X = 4 is removed from the sample,the new mean will be M = 10.

For a positively skewed distribution,the mean usually has a larger value than either the median or the mode.

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

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

Under what circumstances is the median likely to produce a better measure of central tendency than the mean?

What is the mean for the population of scores shown in the frequency distribution table? \ X 5 1 4 2 3 3 2 4 1 2

Introduction to Statistics.

Frequency Distributions.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: The Distribution of Sample Means.

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 Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

Filters