Question 1

The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway.   The mean is

Accepted Answer

A)  9. 
B)  77. 
C)  65. 
D)  67. 
A)  9. 
B)  77. 
C)  65. 
D)  67.

Question 2

The value which has half of the observations above it and half the observations below it is called the

Accepted Answer

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

Question 3

A group of students had dinner at a local restaurant. The total bill for the dinner was $364.99. Each student paid his/her equal share of the bill, which was $21.47. How many student's were at the dinner?

Accepted Answer

A)  124 
B)  365 
C)  17 
D)  22 
A)  124 
B)  365 
C)  17 
D)  22

Question 4

If the coefficient of variation is 40% and the mean is 70, then the variance is

Accepted Answer

A)  28. 
B)  2800. 
C)  1.75. 
D)  784. 
A)  28. 
B)  2800. 
C)  1.75. 
D)  784.

Question 5

The median is a measure of

Accepted Answer

A)  relative dispersion. 
B)  absolute dispersion. 
C)  central location. 
D)  relative location. 
A)  relative dispersion. 
B)  absolute dispersion. 
C)  central location. 
D)  relative location.

Question 6

In computing descriptive statistics from grouped data,

Accepted Answer

A)  data values are treated as if they occur at the midpoint of a class. 
B)  the grouped data result is more accurate than the ungrouped result. 
C)  the grouped data computations are used only when a population is being analyzed. 
D)  none of these alternatives is correct. 
A)  data values are treated as if they occur at the midpoint of a class. 
B)  the grouped data result is more accurate than the ungrouped result. 
C)  the grouped data computations are used only when a population is being analyzed. 
D)  none of these alternatives is correct.

Question 7

The symbol σ is used to represent the

Accepted Answer

A)  variance of the population. 
B)  standard deviation of the sample. 
C)  standard deviation of the population. 
D)  variance of the sample. 
A)  variance of the population. 
B)  standard deviation of the sample. 
C)  standard deviation of the population. 
D)  variance of the sample.

Question 8

μ is an example of a

Accepted Answer

A)  population parameter. 
B)  sample statistic. 
C)  population variance. 
D)  sample mean. 
A)  population parameter. 
B)  sample statistic. 
C)  population variance. 
D)  sample mean.

Question 9

When computing the mean, the smallest value

Accepted Answer

A)  can never be negative. 
B)  can never be zero. 
C)  can never be less than the mean. 
D)  can be any value. 
A)  can never be negative. 
B)  can never be zero. 
C)  can never be less than the mean. 
D)  can be any value.

Question 10

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

Accepted Answer

A)  σ2 
B)  σ 
C)  N 
D)  n 
A)  σ2 
B)  σ 
C)  N 
D)  n

Question 11

​An unusually small or unusually large data value is called

Accepted Answer

A)  correlation coefficient. 
B)  ​a deviation. 
C)  ​an outlier. 
D)  ​a variable. 
A)  correlation coefficient. 
B)  ​a deviation. 
C)  ​an outlier. 
D)  ​a variable.

Question 12

Which of the following is not a measure of variability of a single variable?​

Accepted Answer

A)  Range 
B)  ​Covariance 
C)  ​Standard deviation 
D)  ​Interquartile range 
A)  Range 
B)  ​Covariance 
C)  ​Standard deviation 
D)  ​Interquartile range

Question 13

During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5). The variance of the temperatures of the ten-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 14

The measure of variability easiest to compute, but seldom used as the only measure, is the​

Accepted Answer

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

Question 15

Functionality in interactive data dashboards that allows the user to access information and analyze at an increasingly detailed level is referred to as

Accepted Answer

A)  drilling down. 
B)  transformation. 
C)  root-cause analysis. 
D)  data trimming. 
A)  drilling down. 
B)  transformation. 
C)  root-cause analysis. 
D)  data trimming.

Question 16

When the data are skewed to the right, the measure of Skewness will be

Accepted Answer

A)  negative. 
B)  zero. 
C)  positive. 
D)  one. 
A)  negative. 
B)  zero. 
C)  positive. 
D)  one.

Question 17

The geometric mean of 3, 5, and 6 is

Accepted Answer

A)  9.49. 
B)  2.41. 
C)  4.48. 
D)  3.74. 
A)  9.49. 
B)  2.41. 
C)  4.48. 
D)  3.74.

Question 18

​If the data distribution is symmetric, the skewness is

Accepted Answer

A)  ​0. 
B)  ​.5. 
C)  ​1. 
D)  ​positive. 
A)  ​0. 
B)  ​.5. 
C)  ​1. 
D)  ​positive.

Question 19

Given the following information:​ Standard deviation = 8
Coefficient of variation = 64%
The mean would then be

Accepted Answer

A)  12.5. 
B)  8. 
C)  0.64. 
D)  1.25. 
A)  12.5. 
B)  8. 
C)  0.64. 
D)  1.25.

Question 20

The first quartile is the same as the

Accepted Answer

A)  median. 
B)  25th percentile. 
C)  50th percentile. 
D)  75th percentile. 
A)  median. 
B)  25th percentile. 
C)  50th percentile. 
D)  75th percentile.

Exam 3: Descriptive Statistics: Numerical Measures

The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway. The mean is

The value which has half of the observations above it and half the observations below it is called the

A group of students had dinner at a local restaurant. The total bill for the dinner was $364.99. Each student paid his/her equal share of the bill, which was $21.47. How many student's were at the dinner?

If the coefficient of variation is 40% and the mean is 70, then the variance is

The median is a measure of

In computing descriptive statistics from grouped data,

The symbol σ is used to represent the

μ is an example of a

When computing the mean, the smallest value

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

​An unusually small or unusually large data value is called

Which of the following is not a measure of variability of a single variable?​

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

The measure of variability easiest to compute, but seldom used as the only measure, is the​

Functionality in interactive data dashboards that allows the user to access information and analyze at an increasingly detailed level is referred to as

When the data are skewed to the right, the measure of Skewness will be

The geometric mean of 3, 5, and 6 is

​If the data distribution is symmetric, the skewness is

Given the following information:​ Standard deviation = 8 Coefficient of variation = 64% The mean would then be

The first quartile is the same as 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

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Decision Analysis

Index Numbers

Statistical Methods for Quality Control

Sample Survey

Filters

An unusually small or unusually large data value is called

Which of the following is not a measure of variability of a single variable?

The measure of variability easiest to compute, but seldom used as the only measure, is the

If the data distribution is symmetric, the skewness is

Given the following information: Standard deviation = 8 Coefficient of variation = 64% The mean would then be