Question 1

The symbol $\sigma$2 is used to represent

Accepted Answer

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

Question 2

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 3

The numerical value of the standard deviation can never be

Accepted Answer

A) larger than the variance 
B) zero 
C) negative 
D) smaller than the variance 
A) larger than the variance 
B) zero 
C) negative 
D) smaller than the variance

Question 4

Exhibit 3-5
You are given the following frequency distribution.
  
-Refer to Exhibit 3-5.The variance is

Accepted Answer

A) 570 
B) 5.477 
C) 500 
D) 30 
A) 570 
B) 5.477 
C) 500 
D) 30

Question 5

The pth percentile is a value such that at least p percent of the observations are

Accepted Answer

A) less than or equal to this value 
B) less than this value 
C) more than or equal to this value 
D) more than this value 
A) less than or equal to this value 
B) less than this value 
C) more than or equal to this value 
D) more than this value

Question 6

The coefficient of variation is

Accepted Answer

A) the same as the variance 
B) the standard deviation divided by the mean times 100 
C) the square of the standard deviation 
D) the mean divided by the standard deviation 
A) the same as the variance 
B) the standard deviation divided by the mean times 100 
C) the square of the standard deviation 
D) the mean divided by the standard deviation

Question 7

The value of the sum of the deviations from the mean,i.e. ,  
Must always be

Accepted Answer

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

Question 8

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 9

Descriptive statistics for the closing stock prices of two companies for several trading periods are shown below.
   
a.Which company's stock price has a more dispersed distribution? Explain.Show your complete work and support your answer.
b.Compare the Skewness' of the two and explain what is indicated.

Accepted Answer

a.Coefficient of variation for Baba,Inc

Question 10

The following is a frequency distribution for the ages of a sample of employees at a local company.
   
a.Determine the average age for the sample.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.54.5
b.1

Question 11

The following observations are given for two variables.
   
a.Compute and interpret the sample covariance for the above data.
b.Compute the standard deviation for x.
c.Compute the standard deviation for y.
d.Compute and interpret the sample correlation coefficient.

Accepted Answer

a.19.286 (rounded).Since the covariance

Question 12

Exhibit 3-1
The following data show the number of hours worked by 200 statistics students.
  
-Refer to Exhibit 3-1.The number of students working 19 hours or less

Accepted Answer

A) is 40 
B) is 50 
C) is 90 
D) cannot be determined without the original data 
A) is 40 
B) is 50 
C) is 90 
D) cannot be determined without the original data

Question 13

From a population of size 500,a random sample of 50 items is selected.The mode of the sample

Accepted Answer

A) must be 500 
B) must be equal to the mode of population,if the sample is truly random 
C) must be equal to the mean of the population,if the sample is truly random 
D) can be larger,smaller or equal to the mode of the population 
A) must be 500 
B) must be equal to the mode of population,if the sample is truly random 
C) must be equal to the mean of the population,if the sample is truly random 
D) can be larger,smaller or equal to the mode of the population

Question 14

The following data show the yearly salaries of a sample of MBA graduates.
   
a.Compute the mean yearly salary and give your answer in dollars.
b.Compute the standard deviation and give your answer in dollars.
c.Compute the 75th percentile and give your answer in dollars.Fully explain what the value that you have determined indicates.

Accepted Answer

a.$88,000
b.$9,355.03
c.$94,00

Question 15

The hourly wages of a sample of 130 system analysts are given below.
 
The coefficient of variation equals

Accepted Answer

A) 0.30% 
B) 30% 
C) 5.4% 
D) 54% 
A) 0.30% 
B) 30% 
C) 5.4% 
D) 54%

Question 16

Compute the weighted mean for the following data.

Accepted Answer

The answer of Compute the weighted mean for the following...

Question 17

The 75th percentile is referred to as the

Accepted Answer

A) first quartile 
B) second quartile 
C) third quartile 
D) fourth quartile 
A) first quartile 
B) second quartile 
C) third quartile 
D) fourth quartile

Question 18

$\mu$ is an example of a

Accepted Answer

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

Question 19

Exhibit 3-2
A researcher has collected the following sample data
  
-Refer to Exhibit 3-2.The 75th percentile is

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 8 
A) 5 
B) 6 
C) 7 
D) 8

Question 20

The relative frequency of a class is computed by

Accepted Answer

A) dividing the midpoint of the class by the sample size 
B) dividing the frequency of the class by the midpoint 
C) dividing the sample size by the frequency of the class 
D) dividing the frequency of the class by the sample size 
A) dividing the midpoint of the class by the sample size 
B) dividing the frequency of the class by the midpoint 
C) dividing the sample size by the frequency of the class 
D) dividing the frequency of the class by the sample size

The symbol $\sigma$ ² is used to represent

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

The numerical value of the standard deviation can never be

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5.The variance is

The pth percentile is a value such that at least p percent of the observations are

The coefficient of variation is

The value of the sum of the deviations from the mean,i.e. , Must always be

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 following is a frequency distribution for the ages of a sample of employees at a local company. a.Determine the average age for the sample. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The following observations are given for two variables. a.Compute and interpret the sample covariance for the above data. b.Compute the standard deviation for x. c.Compute the standard deviation for y. d.Compute and interpret the sample correlation coefficient.

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. -Refer to Exhibit 3-1.The number of students working 19 hours or less

From a population of size 500,a random sample of 50 items is selected.The mode of the sample

The hourly wages of a sample of 130 system analysts are given below. The coefficient of variation equals

Compute the weighted mean for the following data.

The 75th percentile is referred to as the

$\mu$ is an example of a

Exhibit 3-2 A researcher has collected the following sample data -Refer to Exhibit 3-2.The 75th percentile is

The relative frequency of a class is computed by

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

Analysis of Variance and Experimental Design

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Index Numbers

Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 3: Descriptive Statistics: Numerical Measures

The symbol σ\sigmaσ 2 is used to represent

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

The numerical value of the standard deviation can never be

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5.The variance is

The pth percentile is a value such that at least p percent of the observations are

The coefficient of variation is

The value of the sum of the deviations from the mean,i.e. , Must always be

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 following is a frequency distribution for the ages of a sample of employees at a local company. a.Determine the average age for the sample. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The following observations are given for two variables. a.Compute and interpret the sample covariance for the above data. b.Compute the standard deviation for x. c.Compute the standard deviation for y. d.Compute and interpret the sample correlation coefficient.

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. -Refer to Exhibit 3-1.The number of students working 19 hours or less

From a population of size 500,a random sample of 50 items is selected.The mode of the sample

The hourly wages of a sample of 130 system analysts are given below. The coefficient of variation equals

Compute the weighted mean for the following data.

The 75th percentile is referred to as the

μ\muμ is an example of a

Exhibit 3-2 A researcher has collected the following sample data -Refer to Exhibit 3-2.The 75th percentile is

The relative frequency of a class is computed by

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

Analysis of Variance and Experimental Design

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Index Numbers

Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

The symbol $\sigma$ ² is used to represent

$\mu$ is an example of a