Question 1

What is the definition of variance?

Accepted Answer

A)  A measure of the variability of scores in a distribution 
B)  The square of the standard deviation 
C)  The average squared deviation from the mean 
D)  All of the above 
A)  A measure of the variability of scores in a distribution 
B)  The square of the standard deviation 
C)  The average squared deviation from the mean 
D)  All of the above D

Question 2

Which of the following is NOT a measure of variability?

Accepted Answer

A)  Correlation 
B)  Standard deviation 
C)  Range 
D)  Semi-interquartile range 
A)  Correlation 
B)  Standard deviation 
C)  Range 
D)  Semi-interquartile range A

Question 3

If a histogram were constructed for a distribution of scores having a mean of 60 and a median of 80, which term would best describe its shape?

Accepted Answer

A)  Skewed 
B)  Normal 
C)  Symmetrical 
D)  Bimodal 
A)  Skewed 
B)  Normal 
C)  Symmetrical 
D)  Bimodal A

Question 4

No meaningful interpretation can be attached to the original or raw scores obtained on a test unless which of the following is/are known?

Accepted Answer

A)  Mean 
B)  Standard deviation 
C)  Shape of the distribution 
D)  All of the above 
A)  Mean 
B)  Standard deviation 
C)  Shape of the distribution 
D)  All of the above

Question 5

Suppose you determined that the mean IQ of a population is 100. What name is given to this piece of information?

Accepted Answer

A)  Estimate 
B)  Prediction 
C)  Parameter 
D)  Statistic 
A)  Estimate 
B)  Prediction 
C)  Parameter 
D)  Statistic

Question 6

Population is to sample as:

Accepted Answer

A)  Roman is to Greek. 
B)  Parameter is to statistic. 
C)  Leg is to body. 
D)  Guessing is to knowing. 
A)  Roman is to Greek. 
B)  Parameter is to statistic. 
C)  Leg is to body. 
D)  Guessing is to knowing.

Question 7

If a graph were constructed for the data resulting from a written exam on which a few students scored low but almost all of the students scored very high, which term would best describe the resulting curve?

Accepted Answer

A)  Mesokurtic 
B)  Skewed 
C)  Trimodal 
D)  Platykurtic 
A)  Mesokurtic 
B)  Skewed 
C)  Trimodal 
D)  Platykurtic

Question 8

What type of measure is B, if B is defined as the difference between score values representing the 90th percentile rank and the 10th percentile rank?

Accepted Answer

A)  Central tendency 
B)  Correlation 
C)  Prediction 
D)  Variability 
A)  Central tendency 
B)  Correlation 
C)  Prediction 
D)  Variability

Question 9

Which of the following is a parameter?

Accepted Answer

A)  S 
B)  σ 
C)  T-score 
D)  M 
A)  S 
B)  σ 
C)  T-score 
D)  M

Question 10

Which of the following curves would most likely be normally distributed?

Accepted Answer

A)  The heights of males and females aged 20 to 40. 
B)  The frequency of heart attacks in males for ages 20 to 80. 
C)  The grip strength of females aged 20 to 80. 
D)  The weight of all male students at a university. 
A)  The heights of males and females aged 20 to 40. 
B)  The frequency of heart attacks in males for ages 20 to 80. 
C)  The grip strength of females aged 20 to 80. 
D)  The weight of all male students at a university.

Question 11

What is the reason to work with samples rather than populations?

Accepted Answer

A)  Populations are continually changing. 
B)  Researchers can rarely test a population. 
C)  Statistical methods are designed to work only with samples. 
D)  Measurements from populations are biased. 
A)  Populations are continually changing. 
B)  Researchers can rarely test a population. 
C)  Statistical methods are designed to work only with samples. 
D)  Measurements from populations are biased.

Question 12

Using the following data, what is the most representative score in this distribution?
30, 12, 7, 7, 6, 5, 3, 2, 0

Accepted Answer

A)  5 
B)  6 
C)  7 
D)  8 
A)  5 
B)  6 
C)  7 
D)  8

Question 13

If the standard deviation of a population is 10, which of the following is most likely to be the value of the standard deviation of a sample from that population?

Accepted Answer

A)  9 
B)  10 
C)  11 
D)  12 
A)  9 
B)  10 
C)  11 
D)  12

Question 14

If every score in a distribution were to be increased by 12 points, what would be the effect on the mean and the median?

Accepted Answer

A)  The mean would not change, but the median would increase by 12 points. 
B)  Both the mean and the median would increase by 12 points. 
C)  The mean would increase by 12 points, but the median would not change. 
D)  None of the above 
A)  The mean would not change, but the median would increase by 12 points. 
B)  Both the mean and the median would increase by 12 points. 
C)  The mean would increase by 12 points, but the median would not change. 
D)  None of the above

Question 15

Using the following data, which measure of central tendency would change most if the highest score were 15 instead of 30?
30, 12, 7, 7, 6, 5, 3, 2, 0

Accepted Answer

A)  Range 
B)  Mean 
C)  Median 
D)  Mode 
A)  Range 
B)  Mean 
C)  Median 
D)  Mode

Question 16

Which of the following traits is TRUE for the normal curve?

Accepted Answer

A)  Asymmetrical 
B)  Leptokurtic 
C)  Mesokurtic 
D)  Platykurtic 
A)  Asymmetrical 
B)  Leptokurtic 
C)  Mesokurtic 
D)  Platykurtic

Question 17

Which of the following is NOT a measure of the center of a distribution?

Accepted Answer

A)  Percentile 
B)  Mean 
C)  Median 
D)  Mode 
A)  Percentile 
B)  Mean 
C)  Median 
D)  Mode

Question 18

Which measure of central tendency is most appropriate for use with a very positively skewed distribution?

Accepted Answer

A)  Mode 
B)  Median 
C)  Mean 
D)  All are equally appropriate 
A)  Mode 
B)  Median 
C)  Mean 
D)  All are equally appropriate

Question 19

$\begin{array}{lcc}
& \text { Mean  } &\text {Standard } \
& &\text { Deviation } \
 \text { Distribution \#1 }& 80&6 \
 \text { Distribution \#2 }&  60 & 8 \
 \text { Distribution \#3 }&  70& 7 \
\end{array}$

-Using the information above, which distribution is the most heterogeneous?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  Cannot determine 
A)  1 
B)  2 
C)  3 
D)  Cannot determine

Question 20

If the sum of N scores is 143, the median of the scores is 13, and the scores are normally distributed, what is N?

Accepted Answer

A)  13 
B)  1859 
C)  11 
D)  Cannot determine 
A)  13 
B)  1859 
C)  11 
D)  Cannot determine

What is the definition of variance?

Which of the following is NOT a measure of variability?

If a histogram were constructed for a distribution of scores having a mean of 60 and a median of 80, which term would best describe its shape?

No meaningful interpretation can be attached to the original or raw scores obtained on a test unless which of the following is/are known?

Suppose you determined that the mean IQ of a population is 100. What name is given to this piece of information?

Population is to sample as:

If a graph were constructed for the data resulting from a written exam on which a few students scored low but almost all of the students scored very high, which term would best describe the resulting curve?

What type of measure is B, if B is defined as the difference between score values representing the 90th percentile rank and the 10th percentile rank?

Which of the following is a parameter?

Which of the following curves would most likely be normally distributed?

What is the reason to work with samples rather than populations?

Using the following data, what is the most representative score in this distribution? 30, 12, 7, 7, 6, 5, 3, 2, 0

If the standard deviation of a population is 10, which of the following is most likely to be the value of the standard deviation of a sample from that population?

If every score in a distribution were to be increased by 12 points, what would be the effect on the mean and the median?

Using the following data, which measure of central tendency would change most if the highest score were 15 instead of 30? 30, 12, 7, 7, 6, 5, 3, 2, 0

Which of the following traits is TRUE for the normal curve?

Which of the following is NOT a measure of the center of a distribution?

Which measure of central tendency is most appropriate for use with a very positively skewed distribution?

Mean Standard Deviation Distribution \#1 80 6 Distribution \#2 60 8 Distribution \#3 70 7 -Using the information above, which distribution is the most heterogeneous?

If the sum of N scores is 143, the median of the scores is 13, and the scores are normally distributed, what is N?

Research Methods

Introduction to Measurement and Statistics

The Normal Curve and Standard Scores

Correlation and Regression

Introduction to Inferential Statistics

Two-Sample T-Test

Issues in Inferential Statistics

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Factorial Anova

Multivariate Anova Manova

Advanced Statistics

Nonparametric Statistics

Filters

Exam 3: Descriptive Statistics

What is the definition of variance?

Which of the following is NOT a measure of variability?

If a histogram were constructed for a distribution of scores having a mean of 60 and a median of 80, which term would best describe its shape?

No meaningful interpretation can be attached to the original or raw scores obtained on a test unless which of the following is/are known?

Suppose you determined that the mean IQ of a population is 100. What name is given to this piece of information?

Population is to sample as:

If a graph were constructed for the data resulting from a written exam on which a few students scored low but almost all of the students scored very high, which term would best describe the resulting curve?

What type of measure is B, if B is defined as the difference between score values representing the 90th percentile rank and the 10th percentile rank?

Which of the following is a parameter?

Which of the following curves would most likely be normally distributed?

What is the reason to work with samples rather than populations?

Using the following data, what is the most representative score in this distribution? 30, 12, 7, 7, 6, 5, 3, 2, 0

If the standard deviation of a population is 10, which of the following is most likely to be the value of the standard deviation of a sample from that population?

If every score in a distribution were to be increased by 12 points, what would be the effect on the mean and the median?

Using the following data, which measure of central tendency would change most if the highest score were 15 instead of 30? 30, 12, 7, 7, 6, 5, 3, 2, 0

Which of the following traits is TRUE for the normal curve?

Which of the following is NOT a measure of the center of a distribution?

Which measure of central tendency is most appropriate for use with a very positively skewed distribution?

Mean Standard Deviation Distribution \#1 80 6 Distribution \#2 60 8 Distribution \#3 70 7 -Using the information above, which distribution is the most heterogeneous?

If the sum of N scores is 143, the median of the scores is 13, and the scores are normally distributed, what is N?

Research Methods

Introduction to Measurement and Statistics

The Normal Curve and Standard Scores

Correlation and Regression

Introduction to Inferential Statistics

Two-Sample T-Test

Issues in Inferential Statistics

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Factorial Anova

Multivariate Anova Manova

Advanced Statistics

Nonparametric Statistics

Filters