Question 1

The _____ denotes the number of standard deviations xi is from the mean $\bar { x }$ .

Accepted Answer

A)  variance 
B)  median 
C)  z-score 
D)  normal deviation 
A)  variance 
B)  median 
C)  z-score 
D)  normal deviation

Question 2

Which of the following depicts a moderately left-skewed distribution?

Accepted Answer

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

Question 3

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

Accepted Answer

A)  COVARIANCE 
B)  COVARIANCE.S 
C)  COVAR 
D)  COVAR.S 
A)  COVARIANCE 
B)  COVARIANCE.S 
C)  COVAR 
D)  COVAR.S

Question 4

If r = 0.48 for data set A and r = -0.48 for data set B, which of the following is true?

Accepted Answer

A)  The variables in A are more strongly correlated than the variables in B. 
B)  The data values in A are all positive, while the data values in B are all negative. 
C)  The two data sets have the same level of correlation. 
D)  None of the answers is correct. 
A)  The variables in A are more strongly correlated than the variables in B. 
B)  The data values in A are all positive, while the data values in B are all negative. 
C)  The two data sets have the same level of correlation. 
D)  None of the answers is correct.

Question 5

Excel's _____ function can be used to compute the sample correlation coefficient.

Accepted Answer

A)  CORR.S 
B)  CORR 
C)  CORREL.S 
D)  CORREL 
A)  CORR.S 
B)  CORR 
C)  CORREL.S 
D)  CORREL

Question 6

During a cold winter, the temperature stayed below zero for 10 days (ranging from -20 to -5). The variance of the temperatures of the 10 day period _____.

Accepted Answer

A)  is negative since all the numbers are negative 
B)  must be at least zero 
C)  cannot be computed since all the numbers are negative 
D)  can be either negative or positive 
A)  is negative since all the numbers are negative 
B)  must be at least zero 
C)  cannot be computed since all the numbers are negative 
D)  can be either negative or positive

Question 7

A graphical summary of data that is based on a five-number summary is a _____.

Accepted Answer

A)  histogram 
B)  stem-and-leaf display 
C)  scatter diagram 
D)  box plot 
A)  histogram 
B)  stem-and-leaf display 
C)  scatter diagram 
D)  box plot

Question 8

Which of the following is NOT a measure of location?

Accepted Answer

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

Question 9

Which of the following values of r indicates the strongest correlation?

Accepted Answer

A)  .82 
B)  .361 
C)  0 
D)  -.9 
A)  .82 
B)  .361 
C)  0 
D)  -.9

Question 10

The difference between the largest and smallest data values is the _____.

Accepted Answer

A)  variance 
B)  interquartile range 
C)  range 
D)  coefficient of variation 
A)  variance 
B)  interquartile range 
C)  range 
D)  coefficient of variation

Question 11

Which of the following descriptive statistics is NOT measured in the same units as the data?

Accepted Answer

A)  35th percentile 
B)  standard deviation 
C)  variance 
D)  interquartile range 
A)  35th percentile 
B)  standard deviation 
C)  variance 
D)  interquartile range

Question 12

Provide a five-number summary for the following data. $$\begin{array} { l l l l l } 
115 & 191 & 153 & 194 & 236 \
184 & 216 & 185 & 183 & 202
\end{array}$$

Accepted Answer

The answer of Provide a five-number summary for the following...

Question 13

The value of the sum of the squared deviations from the mean, i.e., $\Sigma ( x - \bar { x } ) ^ { 2 }$ must always be _____.

Accepted Answer

A)  less than the mean 
B)  negative 
C)  either positive or negative, depending on whether the mean is negative or positive 
D)  at least zero 
A)  less than the mean 
B)  negative 
C)  either positive or negative, depending on whether the mean is negative or positive 
D)  at least zero

Question 14

The mean of a sample is _____.

Accepted Answer

A)  always equal to the mean of the population 
B)  always smaller than the mean of the population 
C)  computed by summing the data values and dividing the sum by (n − 1) 
D)  computed by summing all the data values and dividing the sum by the number of items 
A)  always equal to the mean of the population 
B)  always smaller than the mean of the population 
C)  computed by summing the data values and dividing the sum by (n − 1) 
D)  computed by summing all the data values and dividing the sum by the number of items

Question 15

The sum of deviations of the individual data elements from their mean is _____.

Accepted Answer

A)  always greater than zero 
B)  always less than zero 
C)  sometimes greater than and sometimes less than zero, depending on the data elements 
D)  always equal to zero 
A)  always greater than zero 
B)  always less than zero 
C)  sometimes greater than and sometimes less than zero, depending on the data elements 
D)  always equal to zero

Question 16

In 1998, the average age of students at UTC was 22 with a standard deviation of 3.96. In 1999, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

Accepted Answer

Coefficient of Variation for 1

Question 17

The interquartile range is the difference between the _____.

Accepted Answer

A)  first and second quartiles 
B)  first and third quartiles 
C)  second and third quartiles 
D)  second and fourth quartiles 
A)  first and second quartiles 
B)  first and third quartiles 
C)  second and third quartiles 
D)  second and fourth quartiles

Question 18

A set of visual displays organizing and presenting information used to monitor the performance of a company or organization in a manner that is easy to read, understand, and interpret is called a _____.

Accepted Answer

A)  stem-and-leaf display 
B)  stacked bar chart 
C)  data dashboard 
D)  crosstabulation 
A)  stem-and-leaf display 
B)  stacked bar chart 
C)  data dashboard 
D)  crosstabulation

Question 19

Describe how a comparative analysis using box plots of men's vs. women's salaries at ACME, Inc. could be used.
​

Accepted Answer

Two box plots, one depicting men's and o

Question 20

An important measure of location for categorical data is the _____.

Accepted Answer

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

Exam 3: Descriptive Statistics: Numerical Measures

The _____ denotes the number of standard deviations xi is from the mean xˉ\bar { x }xˉ .

Which of the following depicts a moderately left-skewed distribution?

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

If r = 0.48 for data set A and r = -0.48 for data set B, which of the following is true?

Excel's _____ function can be used to compute the sample correlation coefficient.

During a cold winter, the temperature stayed below zero for 10 days (ranging from -20 to -5). The variance of the temperatures of the 10 day period _____.

A graphical summary of data that is based on a five-number summary is a _____.

Which of the following is NOT a measure of location?

Which of the following values of r indicates the strongest correlation?

The difference between the largest and smallest data values is the _____.

Which of the following descriptive statistics is NOT measured in the same units as the data?

Provide a five-number summary for the following data. 115 191 153 194 236 184 216 185 183 202

The value of the sum of the squared deviations from the mean, i.e., Σ(x−xˉ)2\Sigma ( x - \bar { x } ) ^ { 2 }Σ(x−xˉ)2 must always be _____.

The mean of a sample is _____.

The sum of deviations of the individual data elements from their mean is _____.

In 1998, the average age of students at UTC was 22 with a standard deviation of 3.96. In 1999, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

The interquartile range is the difference between the _____.

A set of visual displays organizing and presenting information used to monitor the performance of a company or organization in a manner that is easy to read, understand, and interpret is called a _____.

Describe how a comparative analysis using box plots of men's vs. women's salaries at ACME, Inc. could be used. ​

An important measure of location for categorical data is the _____.

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 _____ denotes the number of standard deviations x_i is from the mean $\bar { x }$ .

The value of the sum of the squared deviations from the mean, i.e., $\Sigma ( x - \bar { x } ) ^ { 2 }$ must always be _____.

Describe how a comparative analysis using box plots of men's vs. women's salaries at ACME, Inc. could be used.