Question 1

Which of the following is not a measure of dispersion?

Accepted Answer

A)  range 
B)  50th percentile 
C)  standard deviation 
D)  interquartile range 
A)  range 
B)  50th percentile 
C)  standard deviation 
D)  interquartile range

Question 2

In statistics, what does IQR mean?

Accepted Answer

A)  individual quantity range 
B)  inter-quantity relativity 
C)  individual quartile relativity 
D)  inter-quartile range 
A)  individual quantity range 
B)  inter-quantity relativity 
C)  individual quartile relativity 
D)  inter-quartile range

Question 3

The variance of a sample or a population cannot be _____.

Accepted Answer

A)  negative 
B)  calculated 
C)  zero 
D)  less than1 
A)  negative 
B)  calculated 
C)  zero 
D)  less than1

Question 4

For data skewed to the left, the skewness is _____.

Accepted Answer

A)  between 0 and .5 
B)  less than 1 
C)  positive 
D)  negative 
A)  between 0 and .5 
B)  less than 1 
C)  positive 
D)  negative

Question 5

Angela Lopez, a golf instructor, is interested in investigating the relationship between a golfer's average driving distance and 18-hole score. She recently observed the performance of six golfers during one round of a tournament and measured, as accurately as possible, the distances (yards) of their drives and noted their final scores. She then computed each golfer's average drive distance for 18 holes. The results of her sample are shown below.
​ $$\begin{array} { c c c } 
\text { Golfer } & \begin{array} { c } 
\text { Avg. Drive } \
( \text { yards) }
\end{array} & \begin{array} { c } 
18 \text {-Hole } \
\text { Score }
\end{array} \
\hline 1 & 277.6 & 69 \
2 & 259.5 & 71 \
3 & 269.1 & 70 \
4 & 267.0 & 70 \
5 & 255.6 & 71 \
6 & 272.9 & 69 \
\hline
\end{array}$$ ​
Compute and interpret both the sample covariance and the sample correlation coefficient.
​

Accepted Answer

The sample covariance value of -7.08 ind

Question 6

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

Accepted Answer

A)  STDEV 
B)  VAR.SQRT 
C)  STDEv 
D)  STDEV.S 
A)  STDEV 
B)  VAR.SQRT 
C)  STDEv 
D)  STDEV.S

Question 7

In a five-number summary, which of the following is NOT used for data summarization?

Accepted Answer

A)  smallest value 
B)  largest value 
C)  median 
D)  mean 
A)  smallest value 
B)  largest value 
C)  median 
D)  mean

Question 8

The standard deviation of a sample of 100 observations is 64. The variance of the sample is which of the following?

Accepted Answer

A)  8 
B)  10 
C)  6,400 
D)  4,096 
A)  8 
B)  10 
C)  6,400 
D)  4,096

Question 9

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a(n) _____.

Accepted Answer

A)  important mean 
B)  trimmed mean 
C)  weighted mean 
D)  heavy mean 
A)  important mean 
B)  trimmed mean 
C)  weighted mean 
D)  heavy mean

Question 10

The most frequently occurring value of a data set is called the _____.

Accepted Answer

A)  range 
B)  mode 
C)  mean 
D)  None of the answers is correct. 
A)  range 
B)  mode 
C)  mean 
D)  None of the answers is correct.

Question 11

Which of the following symbols represents the variance of a population?

Accepted Answer

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

Question 12

The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately _____.

Accepted Answer

A)  33% 
B)  50% 
C)  68% 
D)  95% 
A)  33% 
B)  50% 
C)  68% 
D)  95%

Question 13

The coefficient of variation is _____.

Accepted Answer

A)  the same as the variance 
B)  the square root of the variance 
C)  the square of the standard deviation 
D)  None of the answers is correct. 
A)  the same as the variance 
B)  the square root of the variance 
C)  the square of the standard deviation 
D)  None of the answers is correct.

Question 14

The interquartile range is used as a measure of variability to overcome what difficulty of the range?

Accepted Answer

A)  The sum of the range variances is zero. 
B)  The range is difficult to compute. 
C)  The range is influenced too much by extreme values. 
D)  The range is negative. 
A)  The sum of the range variances is zero. 
B)  The range is difficult to compute. 
C)  The range is influenced too much by extreme values. 
D)  The range is negative.

Question 15

_____ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.

Accepted Answer

A)  Chebyshev's theorem 
B)  The empirical rule 
C)  A five-number summary 
D)  A box plot 
A)  Chebyshev's theorem 
B)  The empirical rule 
C)  A five-number summary 
D)  A box plot

Question 16

The variance is equal to the _____.

Accepted Answer

A)  absolute value of the standard deviation 
B)  squared value of the standard deviation 
C)  square root of the standard deviation 
D)  inverse value of the standard deviation 
A)  absolute value of the standard deviation 
B)  squared value of the standard deviation 
C)  square root of the standard deviation 
D)  inverse value of the standard deviation

Question 17

The measure of dispersion that is influenced most by extreme values is the _____.

Accepted Answer

A)  variance 
B)  standard deviation 
C)  range 
D)  interquartile range 
A)  variance 
B)  standard deviation 
C)  range 
D)  interquartile range

Question 18

The numerical value of the standard deviation can never be _____.

Accepted Answer

A)  larger than the variance 
B)  zero 
C)  negative 
D)  All of the answers are correct. 
A)  larger than the variance 
B)  zero 
C)  negative 
D)  All of the answers are correct.

Question 19

Interpret the scatter plot in terms of correlation.

Accepted Answer

There is a very stro

Question 20

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

Accepted Answer

A)  VAR 
B)  VAR.C 
C)  VAR.S 
D)  STDEV.SQ 
A)  VAR 
B)  VAR.C 
C)  VAR.S 
D)  STDEV.SQ

Which of the following is not a measure of dispersion?

In statistics, what does IQR mean?

The variance of a sample or a population cannot be _____.

For data skewed to the left, the skewness is _____.

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

In a five-number summary, which of the following is NOT used for data summarization?

The standard deviation of a sample of 100 observations is 64. The variance of the sample is which of the following?

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a(n) _____.

The most frequently occurring value of a data set is called the _____.

Which of the following symbols represents the variance of a population?

The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately _____.

The coefficient of variation is _____.

The interquartile range is used as a measure of variability to overcome what difficulty of the range?

_____ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.

The variance is equal to the _____.

The measure of dispersion that is influenced most by extreme values is the _____.

The numerical value of the standard deviation can never be _____.

Interpret the scatter plot in terms of correlation.

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

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

Exam 3: Descriptive Statistics: Numerical Measures

Which of the following is not a measure of dispersion?

In statistics, what does IQR mean?

The variance of a sample or a population cannot be _____.

For data skewed to the left, the skewness is _____.

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

In a five-number summary, which of the following is NOT used for data summarization?

The standard deviation of a sample of 100 observations is 64. The variance of the sample is which of the following?

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a(n) _____.

The most frequently occurring value of a data set is called the _____.

Which of the following symbols represents the variance of a population?

The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately _____.

The coefficient of variation is _____.

The interquartile range is used as a measure of variability to overcome what difficulty of the range?

_____ can be used to determine the percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution.

The variance is equal to the _____.

The measure of dispersion that is influenced most by extreme values is the _____.

The numerical value of the standard deviation can never be _____.

Interpret the scatter plot in terms of correlation.

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

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