Question 1

A sample of n = 8 scores has a mean of M = 16.For this sample ΣX = 2.

Accepted Answer

A) True 
 B)False  False

Question 2

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 D

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

After every score in a sample is multiplied by 3, the mean is calculated and found to be M = 21.What was the mean for the original scores?

Accepted Answer

A) 7 
B) 21 
C) 63 
D) cannot be determined from the information given 
A) 7 
B) 21 
C) 63 
D) cannot be determined from the information given

Question 5

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 6

One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean of M = 8.If the two samples are combined, what is the mean for the combined set of scores?

Accepted Answer

A) 4.8 
B) 9.6 
C) 10.0 
D) 19.2 
A) 4.8 
B) 9.6 
C) 10.0 
D) 19.2

Question 7

For a negatively skewed distribution with a mean of M = 20, what is the most probable value for the median?

Accepted Answer

A) greater than 20 
B) less than 20 
C) 20 
D) cannot be determined from the information given 
A) greater than 20 
B) less than 20 
C) 20 
D) cannot be determined from the information given

Question 8

For the population of scores shown in the frequency distribution table, the mean is ____. 
$\begin{array}{cc}
X & f \
\hline 5 & 2 \
4 & 1 \
3 & 3 \
2 & 2 \
1 & 2
\end{array}$

Accepted Answer

A)  $ 15 / 5=3 $ 
B)  $ 15 / 10=1.50 $ 
C)  $ 29 / 5=5.80 $ 
D)  $ 29 / 10=2.90 $ 
A)  $ 15 / 5=3 $ 
B)  $ 15 / 10=1.50 $ 
C)  $ 29 / 5=5.80 $ 
D)  $ 29 / 10=2.90 $

Question 9

For a set of scores measured on an ordinal scale, the median is the preferred measure of central tendency.

Accepted Answer

A) True 
 B)False

Question 10

For a perfectly symmetrical distribution with µ = 30, what is the most probably value for 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

Question 11

What is the median for the following set of scores?

Accepted Answer

A) 4 
B) 6 Scores: 1, 2, 6, 11, 17 
C) 8.5 
D) 8 
A) 4 
B) 6 Scores: 1, 2, 6, 11, 17 
C) 8.5 
D) 8

Question 12

For a 100-point exam, a score of X = 65 is definitely above the median.

Accepted Answer

A) True 
 B)False

Question 13

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 14

In a sample of n = 3 scores, two scores are each below the mean by 2 points.The third score is above the mean by 4 points.

Accepted Answer

A) True 
 B)False

Question 15

One item on a questionnaire asks students how many times in a typical week they eat at a fast-food restaurant.The responses for a sample of n = 10 students are summarized in the frequency distribution.What is the best measure of central tendency for these data? $\begin{array}{cc}
X & f \
\hline 5 \text { or more } & 2 \
4 & 3 \
3 & 2 \
2 & 1 \
1 & 1 \
0 & 1
\end{array}$

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 16

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 17

A sample with a mean of M = 20 has ΣX = 120.There are n = 6 scores in the sample.

Accepted Answer

A) True 
 B)False

Question 18

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 19

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 20

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) impossible to determine from the information given 
A) The mean is still M = 6 
B) The mean is M = 7 
C) The mean is M = 8 
D) impossible to determine from the information given

A sample of n = 8 scores has a mean of M = 16.For this sample ΣX = 2.

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?

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

After every score in a sample is multiplied by 3, the mean is calculated and found to be M = 21.What was the mean for the original scores?

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?

One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean of M = 8.If the two samples are combined, what is the mean for the combined set of scores?

For a negatively skewed distribution with a mean of M = 20, what is the most probable value for the median?

For the population of scores shown in the frequency distribution table, the mean is ____. X f 5 2 4 1 3 3 2 2 1 2

For a set of scores measured on an ordinal scale, the median is the preferred measure of central tendency.

For a perfectly symmetrical distribution with µ = 30, what is the most probably value for the mode?

What is the median for the following set of scores?

For a 100-point exam, a score of X = 65 is definitely above the median.

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.

In a sample of n = 3 scores, two scores are each below the mean by 2 points.The third score is above the mean by 4 points.

One item on a questionnaire asks students how many times in a typical week they eat at a fast-food restaurant.The responses for a sample of n = 10 students are summarized in the frequency distribution.What is the best measure of central tendency for these data? X f 5 or more 2 4 3 3 2 2 1 1 1 0 1

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?

A sample with a mean of M = 20 has ΣX = 120.There are n = 6 scores in the sample.

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

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.

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?

Introduction to Statistics

Frequency Distributions

Variability

Z-Scores

Probability

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 Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

Exam 3: Central Tendency

A sample of n = 8 scores has a mean of M = 16.For this sample ΣX = 2.

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?

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

After every score in a sample is multiplied by 3, the mean is calculated and found to be M = 21.What was the mean for the original scores?

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?

One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean of M = 8.If the two samples are combined, what is the mean for the combined set of scores?

For a negatively skewed distribution with a mean of M = 20, what is the most probable value for the median?

For the population of scores shown in the frequency distribution table, the mean is ____. X f 5 2 4 1 3 3 2 2 1 2

For a set of scores measured on an ordinal scale, the median is the preferred measure of central tendency.

For a perfectly symmetrical distribution with µ = 30, what is the most probably value for the mode?

What is the median for the following set of scores?

For a 100-point exam, a score of X = 65 is definitely above the median.

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.

In a sample of n = 3 scores, two scores are each below the mean by 2 points.The third score is above the mean by 4 points.

One item on a questionnaire asks students how many times in a typical week they eat at a fast-food restaurant.The responses for a sample of n = 10 students are summarized in the frequency distribution.What is the best measure of central tendency for these data? X f 5 or more 2 4 3 3 2 2 1 1 1 0 1

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?

A sample with a mean of M = 20 has ΣX = 120.There are n = 6 scores in the sample.

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

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.

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?

Introduction to Statistics

Frequency Distributions

Variability

Z-Scores

Probability

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 Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters