Question 1

The mean is computed by summing all of the scores and then dividing the sum by the:

Accepted Answer

A) standard deviation 
B) mean divisor 
C) total number of scores 
D) average number of scores 
A) standard deviation 
B) mean divisor 
C) total number of scores 
D) average number of scores

Question 2

Suppose a researcher was interested in determining the effect of an experimental drug on the lifespan of laboratory rats.Shown below is a summary of the lifespans,in months,for laboratory animals administered the drug.Compute the median number of months the animals survived.

Accepted Answer

A) 3.1 
B) 25 
C) 3.0 
D) 2.9 
A) 3.1 
B) 25 
C) 3.0 
D) 2.9

Question 3

Most of the inferential statistics used by behavioral scientists make use of the _____ as a measure of central tendency.

Accepted Answer

A) mean 
B) median 
C) mode 
D) all are used with equal frequency 
A) mean 
B) median 
C) mode 
D) all are used with equal frequency

Question 4

The major problem with the mode as a measure of central tendency is that there can be
only one modal score.

Accepted Answer

A) True 
 B)False

Question 5

In positively skewed distributions,most scores occur _____ the mean and only a relatively few extreme scores occur _____ it.

Accepted Answer

A) below;above 
B) at;above 
C) at;below 
A) below;above 
B) at;above 
C) at;below

Question 6

If a distribution is less peaked than another,it is said to be more _____;if it is more peaked than another,it is said to be more_____.

Accepted Answer

A) skewed;variable 
B) leptokurtic;variable 
C) platykurtic;leptokurtic 
D) leptokurtic;platykurtic 
A) skewed;variable 
B) leptokurtic;variable 
C) platykurtic;leptokurtic 
D) leptokurtic;platykurtic

Question 7

The mean of a set of scores is best described as _____.

Accepted Answer

A) a simple arithmetic average 
B) an arithmetic average weighted by the number of subjects 
C) usually equal to the mode 
D) relatively free of the effects of extreme values 
A) a simple arithmetic average 
B) an arithmetic average weighted by the number of subjects 
C) usually equal to the mode 
D) relatively free of the effects of extreme values

Question 8

If a distribution is positively skewed,this means that

Accepted Answer

A) the scores tend to be clustered towards the high end of the scale. 
B) the scores tend to be clustered towards the low end of the scale. 
C) the scores are positive numbers. 
D) the distribution is highly peakeD. 
A) the scores tend to be clustered towards the high end of the scale. 
B) the scores tend to be clustered towards the low end of the scale. 
C) the scores are positive numbers. 
D) the distribution is highly peakeD.

Question 9

The extent to which scores in a distribution differ is indicated by _____.

Accepted Answer

A) measures of central tendency 
B) measures of variability 
C) the result of subtracting each score from the median 
D) the average of the mean and the standard deviation 
A) measures of central tendency 
B) measures of variability 
C) the result of subtracting each score from the median 
D) the average of the mean and the standard deviation

Question 10

Which measure of central tendency is affected by extreme scores?

Accepted Answer

A) mode 
B) median 
C) mean 
A) mode 
B) median 
C) mean

Question 11

What is the relationship between central tendency and variability?

Accepted Answer

Central tendency and variability represe

Question 12

Measures of _____ indicate the extent to which scores within a set differ from one another.

Accepted Answer

A) central tendency 
B) variability 
C) differential tendency 
D) none of these 
A) central tendency 
B) variability 
C) differential tendency 
D) none of these

Question 13

What measure of central tendency is used with a nominal scale?

Accepted Answer

A) Mean 
B) Median 
C) Mode 
D) Both mean and mode 
E) All of these 
A) Mean 
B) Median 
C) Mode 
D) Both mean and mode 
E) All of these

Question 14

When referring to qualitative variables,maximum variability occurs when

Accepted Answer

A) the standard deviation is a large number. 
B) the number of individuals is evenly divided among the possible categories. 
C) all of the individuals fall into a single category. 
D) none of these 
A) the standard deviation is a large number. 
B) the number of individuals is evenly divided among the possible categories. 
C) all of the individuals fall into a single category. 
D) none of these

Question 15

The measure of Central tendency most commonly reported is the mean.

Accepted Answer

A) True 
 B)False

Question 16

What is a central tendency?

Accepted Answer

A central tendency refers to an average,

Question 17

The average person can hold 7+2 digits or bits of information in their short term memory with an SD= 2.What is the variance?

Accepted Answer

A) 9 
B) 4 
C) 7 
D) None of these 
A) 9 
B) 4 
C) 7 
D) None of these

Question 18

Which of the following statements is true of the mode of any set of scores?

Accepted Answer

A) It is the score which occurs most frequently. 
B) It is always less than the mean. 
C) Both a and b. 
D) Neither a nor b. 
A) It is the score which occurs most frequently. 
B) It is always less than the mean. 
C) Both a and b. 
D) Neither a nor b.

Question 19

The mean of a set of scores is the arithmetic average of the scores.

Accepted Answer

A) True 
 B)False

Question 20

The concepts of mean,median,and mode are applicable to continuous and discrete variables.

Accepted Answer

A) True 
 B)False

The mean is computed by summing all of the scores and then dividing the sum by the:

Suppose a researcher was interested in determining the effect of an experimental drug on the lifespan of laboratory rats.Shown below is a summary of the lifespans,in months,for laboratory animals administered the drug.Compute the median number of months the animals survived.

Most of the inferential statistics used by behavioral scientists make use of the _____ as a measure of central tendency.

The major problem with the mode as a measure of central tendency is that there can be only one modal score.

In positively skewed distributions,most scores occur _ the mean and only a relatively few extreme scores occur _ it.

If a distribution is less peaked than another,it is said to be more _;if it is more peaked than another,it is said to be more_.

The mean of a set of scores is best described as _____.

If a distribution is positively skewed,this means that

The extent to which scores in a distribution differ is indicated by _____.

Which measure of central tendency is affected by extreme scores?

What is the relationship between central tendency and variability?

Measures of _____ indicate the extent to which scores within a set differ from one another.

What measure of central tendency is used with a nominal scale?

When referring to qualitative variables,maximum variability occurs when

The measure of Central tendency most commonly reported is the mean.

What is a central tendency?

The average person can hold 7+2 digits or bits of information in their short term memory with an SD= 2.What is the variance?

Which of the following statements is true of the mode of any set of scores?

The mean of a set of scores is the arithmetic average of the scores.

The concepts of mean,median,and mode are applicable to continuous and discrete variables.

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Percentiles percentile Ranks standard Scores and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Probability

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Independent Groups T -Test

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

Exam 3: Measures of Central Tendency and Variability

The mean is computed by summing all of the scores and then dividing the sum by the:

Suppose a researcher was interested in determining the effect of an experimental drug on the lifespan of laboratory rats.Shown below is a summary of the lifespans,in months,for laboratory animals administered the drug.Compute the median number of months the animals survived.

Most of the inferential statistics used by behavioral scientists make use of the _____ as a measure of central tendency.

The major problem with the mode as a measure of central tendency is that there can be only one modal score.

In positively skewed distributions,most scores occur _____ the mean and only a relatively few extreme scores occur _____ it.

If a distribution is less peaked than another,it is said to be more _____;if it is more peaked than another,it is said to be more_____.

The mean of a set of scores is best described as _____.

If a distribution is positively skewed,this means that

The extent to which scores in a distribution differ is indicated by _____.

Which measure of central tendency is affected by extreme scores?

What is the relationship between central tendency and variability?

Measures of _____ indicate the extent to which scores within a set differ from one another.

What measure of central tendency is used with a nominal scale?

When referring to qualitative variables,maximum variability occurs when

The measure of Central tendency most commonly reported is the mean.

What is a central tendency?

The average person can hold 7+2 digits or bits of information in their short term memory with an SD= 2.What is the variance?

Which of the following statements is true of the mode of any set of scores?

The mean of a set of scores is the arithmetic average of the scores.

The concepts of mean,median,and mode are applicable to continuous and discrete variables.

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Percentiles percentile Ranks standard Scores and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Probability

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Independent Groups T -Test

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

In positively skewed distributions,most scores occur _ the mean and only a relatively few extreme scores occur _ it.

If a distribution is less peaked than another,it is said to be more _;if it is more peaked than another,it is said to be more_.