Exam 2: Describing the Distribution of a Single Variable

An operations management professor is interested in how her students performed on her midterm exam. The histogram shown below represents the distribution of exam scores (where the maximum score is 100) for 50 students. Based on this histogram, how would you characterize the students' performance on this exam?

(Essay)

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Question 21

A political figure running for re-election claimed that the country was better off in 2017 than in 2007, because the average income increased. Do you agree?

(Essay)

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Question 22

In an extremely right-skewed distribution, the mean is much smaller than the median.

(True/False)

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Question 23

How would you describe the salary of Virginia's teachers compared to those across the entire United States? Justify your answer.

(Essay)

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Question 24

The mean is a measure of central tendency.

(True/False)

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Question 25

As a measure of variability, what is defined as the maximum value minus the minimum value?

(Multiple Choice)

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Question 26

The histogram below represents scores achieved by 250 job applicants on a personality profile. -What percentage of the job applicants scored between 30 and 40?

(Short Answer)

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Question 27

The median is one of the most frequently used measures of variability.

(True/False)

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Question 28

Calculate the interquartile range. What does this tell you about the data?

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Question 29

In the term "frequency table," frequency refers to the counts of observations in specified categories.

(True/False)

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Question 30

Statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below. -Explain why the mean and median are different.

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Question 31

Expressed in percentiles, the interquartile range is the difference between the:

(Multiple Choice)

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Question 32

The histogram below represents scores achieved by 250 job applicants on a personality profile. -What percentage of the job applicants scored below 60?

(Short Answer)

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Question 33

Half of the job applicants scored below what value?

(Short Answer)

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Question 34

The median can also be described as the:

(Multiple Choice)

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Question 35

All nominal data may be treated as ordinal data.

(True/False)

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Question 36

Abby has been keeping track of what she spends to stream movies. The last seven week's expenditures, in dollars, were 6, 4, 8, 9, 6, 12, and 4. The mean amount Abby spends on streaming movies is $7.

(True/False)

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Question 37

How is the median defined if the number of observations is even?

(Multiple Choice)

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Question 38

Researchers may try to gain insight into the characteristics of a population by examining a(n) _____ of the population.

(Multiple Choice)

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Question 39

Categorical variables can be classified as either discrete or continuous.

(True/False)

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Question 40

Showing 21 - 40 of 100

A political figure running for re-election claimed that the country was better off in 2017 than in 2007, because the average income increased. Do you agree?

In an extremely right-skewed distribution, the mean is much smaller than the median.

How would you describe the salary of Virginia's teachers compared to those across the entire United States? Justify your answer.

The mean is a measure of central tendency.

As a measure of variability, what is defined as the maximum value minus the minimum value?

The histogram below represents scores achieved by 250 job applicants on a personality profile. -What percentage of the job applicants scored between 30 and 40?

The median is one of the most frequently used measures of variability.

Calculate the interquartile range. What does this tell you about the data?

In the term "frequency table," frequency refers to the counts of observations in specified categories.

Statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below. -Explain why the mean and median are different.

Expressed in percentiles, the interquartile range is the difference between the:

The histogram below represents scores achieved by 250 job applicants on a personality profile. -What percentage of the job applicants scored below 60?

Half of the job applicants scored below what value?

The median can also be described as the:

All nominal data may be treated as ordinal data.

Abby has been keeping track of what she spends to stream movies. The last seven week's expenditures, in dollars, were 6, 4, 8, 9, 6, 12, and 4. The mean amount Abby spends on streaming movies is $7.

How is the median defined if the number of observations is even?

Researchers may try to gain insight into the characteristics of a population by examining a(n) _____ of the population.

Categorical variables can be classified as either discrete or continuous.

Introduction to Business Analytics

Finding Relationships Among Variables

Probability and Probability Distributions

Normal, Binomial, Poisson, and Exponential Distributions

Decision Making Under Uncertainty

Sampling and Sampling Distributions

Confidence Interval Estimation

Hypothesis Testing

Regression Analysis: Estimating Relationships

Regression Analysis: Statistical Inference

Time Series Analysis and Forecasting

Introduction to Optimization Modeling

Optimization Models

Introduction to Simulation Modeling

Simulation Models

Data Mining

Importing Data Into Excel

Analysis of Variance and Experimental Design

Statistical Process Control

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