Question 1

Calculate the mode, median, and mean.

Accepted Answer

To calculate the mode, median, and mean,

Question 2

In a grouped frequency distribution, each row represents a unique value of the variable, the second column is the frequency of that value in the population, and the third column is the percentage of all responses at that value of the variable.

Accepted Answer

A) True 
 B)False

Question 3

When is the median the best measure of central tendency?

Accepted Answer

A)  The data are in a symmetrical distribution 
B)  When there are a large number of cases 
C)  There is a great deal of variability in the scores 
D)  The data are highly skewed 
A)  The data are in a symmetrical distribution 
B)  When there are a large number of cases 
C)  There is a great deal of variability in the scores 
D)  The data are highly skewed

Question 4

Joe had a percentile rank of 70 on a standardized math test. What does that mean?

Accepted Answer

A)  He did poorly, since he only correctly answered 70% of the questions 
B)  He did well in that he scored higher than 70% of the people that took the test 
C)  He did well, in that he answered 70% of the items correctly 
D)  He did poorly since he only answered 70% of the items that an average individual would answer correctly 
A)  He did poorly, since he only correctly answered 70% of the questions 
B)  He did well in that he scored higher than 70% of the people that took the test 
C)  He did well, in that he answered 70% of the items correctly 
D)  He did poorly since he only answered 70% of the items that an average individual would answer correctly

Question 5

The two subfields in hypothesis testing are point and interval exploration.

Accepted Answer

A) True 
 B)False

Question 6

With IQ scores with a mean of 100 and a standard deviation of 15, what is the range of scores between which 95% of people should score?

Accepted Answer

A)  100 and 130 
B)  85 and 115 
C)  70 and 100 
D)  70 and 130 
A)  100 and 130 
B)  85 and 115 
C)  70 and 100 
D)  70 and 130

Question 7

Which of the following distributions is closest to being symmetrical?

Accepted Answer

A)    
B)    
C)    
A)    
B)    
C)

Question 8

What is a disadvantage of the mode as a measure of central tendency?

Accepted Answer

A)  It is influenced by extreme scores 
B)  It is imprecise 
C)  It cannot be easily interpreted 
D)  It does not take into account the magnitude of all the scores 
A)  It is influenced by extreme scores 
B)  It is imprecise 
C)  It cannot be easily interpreted 
D)  It does not take into account the magnitude of all the scores

Question 9

Which statement best captures the relationship between handedness and major?

Accepted Answer

A)  Major is unrelated to handedness 
B)  Left-handed people are more likely to major in humanities than right-handed people 
C)  Right-handed people are more likely to major in science than left-handed people 
D)  Left-handed people are more likely to major in science than right-handed people 
A)  Major is unrelated to handedness 
B)  Left-handed people are more likely to major in humanities than right-handed people 
C)  Right-handed people are more likely to major in science than left-handed people 
D)  Left-handed people are more likely to major in science than right-handed people

Question 10

While studying families living in an inner city neighborhood (where most of the residents have incomes well below the poverty level), Dr. Westbrook found that one resident was actually a very wealthy individual. In terms of income level this person would be considered:

Accepted Answer

A)  A variance 
B)  A standard deviation 
C)  An outlier 
D)  A mode 
A)  A variance 
B)  A standard deviation 
C)  An outlier 
D)  A mode

Question 11

When the points in a scatter plot clearly move in a bottom-left to top-right direction, one has a _______ relationship.

Accepted Answer

A)  Positive 
B)  Negative 
C)  Causative 
D)  None of the above 
A)  Positive 
B)  Negative 
C)  Causative 
D)  None of the above

Question 12

The mode is:

Accepted Answer

A)  The arithmetic average 
B)  The middle score 
C)  The most frequent score 
D)  A measure of variability 
A)  The arithmetic average 
B)  The middle score 
C)  The most frequent score 
D)  A measure of variability

Question 13

In a grouped frequency distribution, it is important that the intervals:

Accepted Answer

A)  Are overlapping 
B)  Do not include extreme scores 
C)  Are no greater than 5 units 
D)  Are exhaustive 
A)  Are overlapping 
B)  Do not include extreme scores 
C)  Are no greater than 5 units 
D)  Are exhaustive

Question 14

In simple regression, the _____ is defined as the predicted change in Y given a one-unit change in X.

Accepted Answer

A)  Y intercept 
B)  Regression coefficient 
C)  Error term 
D)  X intercept 
A)  Y intercept 
B)  Regression coefficient 
C)  Error term 
D)  X intercept

Question 15

If your grade on a test was determined by your standing relative to others in a class and you had a score of 90, what class should you most like to be in (hint: which one has the largest z score)?

Accepted Answer

A)  Mean grade = 85, SD = 10 
B)  Mean grade = 83, SD = 5 
C)  Mean grade = 80, SD = 20 
D)  Mean grade = 90, SD = 5 
A)  Mean grade = 85, SD = 10 
B)  Mean grade = 83, SD = 5 
C)  Mean grade = 80, SD = 20 
D)  Mean grade = 90, SD = 5

Question 16

Explain the purpose of descriptive statistics.

Accepted Answer

Descriptive statistics serve the primary

Question 17

If you sum your scores for a variable and divide that sum by the number of scores in the variable, what do you obtain?

Accepted Answer

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

Question 18

Which will have the highest score value in the distribution?

Accepted Answer

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

Question 19

The regression line is:

Accepted Answer

A)  The line that splits the distribution in half 
B)  The line that best fits a pattern of observations 
C)  A line between the median and the mean 
D)  A line between the median and the mode 
A)  The line that splits the distribution in half 
B)  The line that best fits a pattern of observations 
C)  A line between the median and the mean 
D)  A line between the median and the mode

Question 20

How is the distribution skewed?

Accepted Answer

A)  Positive skew 
B)  Negative skew 
C)  Symmetrical 
D)  No skew 
A)  Positive skew 
B)  Negative skew 
C)  Symmetrical 
D)  No skew

Exam 18: Descriptive Statistics

Calculate the mode, median, and mean.

In a grouped frequency distribution, each row represents a unique value of the variable, the second column is the frequency of that value in the population, and the third column is the percentage of all responses at that value of the variable.

When is the median the best measure of central tendency?

Joe had a percentile rank of 70 on a standardized math test. What does that mean?

The two subfields in hypothesis testing are point and interval exploration.

With IQ scores with a mean of 100 and a standard deviation of 15, what is the range of scores between which 95% of people should score?

Which of the following distributions is closest to being symmetrical?

What is a disadvantage of the mode as a measure of central tendency?

Which statement best captures the relationship between handedness and major?

While studying families living in an inner city neighborhood (where most of the residents have incomes well below the poverty level), Dr. Westbrook found that one resident was actually a very wealthy individual. In terms of income level this person would be considered:

When the points in a scatter plot clearly move in a bottom-left to top-right direction, one has a _______ relationship.

The mode is:

In a grouped frequency distribution, it is important that the intervals:

In simple regression, the _____ is defined as the predicted change in Y given a one-unit change in X.

If your grade on a test was determined by your standing relative to others in a class and you had a score of 90, what class should you most like to be in (hint: which one has the largest z score)?

Explain the purpose of descriptive statistics.

If you sum your scores for a variable and divide that sum by the number of scores in the variable, what do you obtain?

Which will have the highest score value in the distribution?

The regression line is:

How is the distribution skewed?

Introduction to Educational Research

Quantitative, Qualitative, and Mixed Research

Action Research for Lifelong Learning

How to Review the Literature and Develop Research Questions

How to Write a Research Proposal

Research Ethics

Standardized Measurement and Assessment

How to Construct a Questionnaire

Methods of Data Collection

Sampling in Quantitative, Qualitative, and Mixed Research

Validity of Research Results in Quantitative, Qualitative, and Mixed Research

Experimental Research: Weak and Strong Designs

Experimental Research: Quasi and Single-Case Designs

Nonexperimental Quantitative Research

Narrative Inquiry and Case Study Research

Phenomenology, Ethnography, and Grounded Theory

Mixed Research

Inferential Statistics

Data Analysis in Qualitative and Mixed Research

How to Prepare a Research Report and Use Apa Style Guidelines

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