Question 1

Which of the following symbols represents the size of a sample?

Accepted Answer

A)  σ 2 
B)  σ 
C)  N 
D)  n 
A)  σ 2 
B)  σ 
C)  N 
D)  n

Question 2

The symbol for _____ is $\rho  $.

Accepted Answer

A)  sample covariance 
B)  population covariance 
C)  sample correlation 
D)  population correlation 
A)  sample covariance 
B)  population covariance 
C)  sample correlation 
D)  population correlation

Question 3

Which of the following is a measure of dispersion?

Accepted Answer

A)  percentiles 
B)  quartiles 
C)  interquartile range 
D)  All of the answers are correct. 
A)  percentiles 
B)  quartiles 
C)  interquartile range 
D)  All of the answers are correct.

Question 4

The symbol σ 2 is used to represent the _____.

Accepted Answer

A)  variance of a population 
B)  standard deviation of a sample 
C)  standard deviation of a population 
D)  variance of a sample 
A)  variance of a population 
B)  standard deviation of a sample 
C)  standard deviation of a population 
D)  variance of a sample

Question 5

A numerical measure of linear association between two variables is the _____.

Accepted Answer

A)  variance 
B)  z-score 
C)  correlation coefficient 
D)  None of the answers is correct. 
A)  variance 
B)  z-score 
C)  correlation coefficient 
D)  None of the answers is correct.

Question 6

Which of the following symbols represents the mean of a sample?

Accepted Answer

A)  ? 2 
B)  ? 
C)  ? 
D)  $\bar { x }$ 
A)  ? 2 
B)  ? 
C)  ? 
D)  $\bar { x }$

Question 7

In computing descriptive statistics for grouped data, the _____ are used to approximate the data values in each class.

Accepted Answer

A)  class lower limits 
B)  class upper limits 
C)  class midpoints 
D)  class ranges 
A)  class lower limits 
B)  class upper limits 
C)  class midpoints 
D)  class ranges

Question 8

Since the mode is the most frequently occurring data value, it _____.

Accepted Answer

A)  can never be larger than the mean 
B)  is always larger than the median 
C)  is always larger than the mean 
D)  None of the answers is correct. 
A)  can never be larger than the mean 
B)  is always larger than the median 
C)  is always larger than the mean 
D)  None of the answers is correct.

Question 9

If a data set has an even number of observations, the median _____.

Accepted Answer

A)  cannot be determined 
B)  is the observation recorded most often 
C)  must be equal to the mean 
D)  is the average value of the two middle items when all items are arranged in ascending order 
A)  cannot be determined 
B)  is the observation recorded most often 
C)  must be equal to the mean 
D)  is the average value of the two middle items when all items are arranged in ascending order

Question 10

In computing the pth percentile, if the index i is an integer the pth percentile is the _____.

Accepted Answer

A)  data value in position i 
B)  data value in position i + 1 
C)  average of data values in positions i and i + 1 
D)  average of data values in positions i and i - 1 
A)  data value in position i 
B)  data value in position i + 1 
C)  average of data values in positions i and i + 1 
D)  average of data values in positions i and i - 1

Question 11

A box plot is a graphical representation of data that is based on _____.

Accepted Answer

A)  the empirical rule 
B)  z-scores 
C)  a histogram 
D)  a five-number summary 
A)  the empirical rule 
B)  z-scores 
C)  a histogram 
D)  a five-number summary

Question 12

Generally, which of the following is the least appropriate measure of central tendency for a data set that contains outliers?

Accepted Answer

A)  mean 
B)  median 
C)  mode 
D)  midrange 
A)  mean 
B)  median 
C)  mode 
D)  midrange

Question 13

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is _____.

Accepted Answer

A)  the range 
B)  the interquartile range 
C)  both the range and the interquartile range 
D)  neither the range nor the interquartile range 
A)  the range 
B)  the interquartile range 
C)  both the range and the interquartile range 
D)  neither the range nor the interquartile range

Question 14

Excel's _____ function can be used to compute the mean.

Accepted Answer

A)  MAX 
B)  AVERAGE 
C)  MEDIAN 
D)  MODE 
A)  MAX 
B)  AVERAGE 
C)  MEDIAN 
D)  MODE

Question 15

The sample variance _____.

Accepted Answer

A)  is always smaller than the true value of the population variance 
B)  is always larger than the true value of the population variance 
C)  could be smaller, equal to, or larger than the true value of the population variance 
D)  can never be zero 
A)  is always smaller than the true value of the population variance 
B)  is always larger than the true value of the population variance 
C)  could be smaller, equal to, or larger than the true value of the population variance 
D)  can never be zero

Question 16

The descriptive measure NOT measured in the same units as the original data is the _____.

Accepted Answer

A)  median 
B)  standard deviation 
C)  mode 
D)  variance 
A)  median 
B)  standard deviation 
C)  mode 
D)  variance

Question 17

Chebyshev's theorem is applicable _____.

Accepted Answer

A)  only to large (n > 30) data sets 
B)  only to data sets with no outliers 
C)  only to bell-shaped data sets 
D)  to any data set 
A)  only to large (n > 30) data sets 
B)  only to data sets with no outliers 
C)  only to bell-shaped data sets 
D)  to any data set

Question 18

The symbol for _____ is r.

Accepted Answer

A)  sample covariance 
B)  population covariance 
C)  sample correlation 
D)  population correlation 
A)  sample covariance 
B)  population covariance 
C)  sample correlation 
D)  population correlation

Question 19

The measure of central location most often reported for annual income and property value data is the _____.

Accepted Answer

A)  median 
B)  mode 
C)  weighted mean 
D)  aggregate mean 
A)  median 
B)  mode 
C)  weighted mean 
D)  aggregate mean

Question 20

A numerical measure, such as a mean, computed from a population is known as a _____.

Accepted Answer

A)  population parameter 
B)  sample parameter 
C)  sample statistic 
D)  population statistic 
A)  population parameter 
B)  sample parameter 
C)  sample statistic 
D)  population statistic

Exam 3: Descriptive Statistics: Numerical Measures

Which of the following symbols represents the size of a sample?

The symbol for _____ is ρ\rho ρ .

Which of the following is a measure of dispersion?

The symbol σ 2 is used to represent the _____.

A numerical measure of linear association between two variables is the _____.

Which of the following symbols represents the mean of a sample?

In computing descriptive statistics for grouped data, the _____ are used to approximate the data values in each class.

Since the mode is the most frequently occurring data value, it _____.

If a data set has an even number of observations, the median _____.

In computing the pth percentile, if the index i is an integer the pth percentile is the _____.

A box plot is a graphical representation of data that is based on _____.

Generally, which of the following is the least appropriate measure of central tendency for a data set that contains outliers?

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is _____.

Excel's _____ function can be used to compute the mean.

The sample variance _____.

The descriptive measure NOT measured in the same units as the original data is the _____.

Chebyshev's theorem is applicable _____.

The symbol for _____ is r.

The measure of central location most often reported for annual income and property value data is the _____.

A numerical measure, such as a mean, computed from a population is known as a _____.

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence, and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

The symbol for _____ is $\rho$ .

The symbol σ ² is used to represent the _____.