Question 1

The standard deviation of a sample was reported to be 20.The report indicated that  
= 7200.What has been the sample size?

Accepted Answer

A) 16 
B) 17 
C) 18 
D) 19 
A) 16 
B) 17 
C) 18 
D) 19

Question 2

The coefficient of correlation ranges between

Accepted Answer

A) 0 and 1 
B) -1 and +1 
C) minus infinity and plus infinity 
D) 1 and 100 
A) 0 and 1 
B) -1 and +1 
C) minus infinity and plus infinity 
D) 1 and 100

Question 3

A group of students had dinner at a local restaurant.The total bill for the dinner was $414.70.Each student paid his/her equal share of the bill,which was $18.85.How many student's were at the dinner?

Accepted Answer

A) 4 
B) 415 
C) 19 
D) 22 
A) 4 
B) 415 
C) 19 
D) 22

Question 4

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.
  
-Refer to Exhibit 3-4.The mean is

Accepted Answer

A) 35 
B) 670 
C) 10 
D) 67 
A) 35 
B) 670 
C) 10 
D) 67

Question 5

The weights (in pounds)of a sample of 36 individuals were recorded and the following statistics were calculated.
 
The coefficient of variation equals

Accepted Answer

A) 0.1125% 
B) 11.25% 
C) 203.12% 
D) 0.20312% 
A) 0.1125% 
B) 11.25% 
C) 203.12% 
D) 0.20312%

Question 6

Exhibit 3-3
A researcher has collected the following sample data.The mean of the sample is 5.
  
-Refer to Exhibit 3-3.The coefficient of variation is

Accepted Answer

A) 72.66% 
B) 81.24% 
C) 264% 
D) 330% 
A) 72.66% 
B) 81.24% 
C) 264% 
D) 330%

Question 7

The 50th percentile is the

Accepted Answer

A) mode 
B) median 
C) mean 
D) third quartile 
A) mode 
B) median 
C) mean 
D) third quartile

Question 8

Global Engineers hired the following number of Class 1 engineers during the first six months of the past year.(Assume the data represent a sample. )
   
a.Determine the mean,the median,the mode,and the range for the above data.
b.Compute the variance and the standard deviation.
c.Compute the first and the third quartiles.
d.Compute the z-scores for the months of May and June.

Accepted Answer

a.Mean = 2.833 Median = 2.5 Mo

Question 9

The following data show the yearly salaries of a sample of EMBA 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.$98,000
b.$9,355.03
c.$104,0

Question 10

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
  
-Refer to Exhibit 3-6.The variance is

Accepted Answer

A) 2.828 
B) 8 
C) 9 
D) 81 
A) 2.828 
B) 8 
C) 9 
D) 81

Question 11

The numerical value of the variance

Accepted Answer

A) is always larger than the numerical value of the standard deviation 
B) is always smaller than the numerical value of the standard deviation 
C) is negative if the mean is negative 
D) can be larger or smaller than the numerical value of the standard deviation 
A) is always larger than the numerical value of the standard deviation 
B) is always smaller than the numerical value of the standard deviation 
C) is negative if the mean is negative 
D) can be larger or smaller than the numerical value of the standard deviation

Question 12

The following data represent the daily demand (y in thousands of units)and the unit price (x in dollars)for a product.
   
a.Compute and interpret the sample covariance for the above data.
b.Compute and interpret the sample correlation coefficient.

Accepted Answer

a.-47.Since the covariance is

Question 13

The following frequency distribution shows the ACT scores of a sample of students:
   
For the above data,compute the following. 
a.The mean
b.The standard deviation

Accepted Answer

The answer of The following frequency distribution shows the ACT...

Question 14

The amount of time that a sample of students spends watching television per day is given below.
   
a.Compute the mean.
b.Compute the median.
c.Compute the standard deviation.
d.Compute the 75th percentile.

Accepted Answer

a.46
b.44

Question 15

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

Accepted Answer

A) 570 
B) 5.477 
C) 25 
D) 30 
A) 570 
B) 5.477 
C) 25 
D) 30

Question 16

The variance of the sample

Accepted Answer

A) can never be negative 
B) can be negative 
C) cannot be zero 
D) cannot be less than one 
A) can never be negative 
B) can be negative 
C) cannot be zero 
D) cannot be less than one

Question 17

The first quartile

Accepted Answer

A) contains at least one third of the data elements 
B) is the same as the 25th percentile 
C) is the same as the 50th percentile 
D) is the same as the 75th percentile 
A) contains at least one third of the data elements 
B) is the same as the 25th percentile 
C) is the same as the 50th percentile 
D) is the same as the 75th percentile

Question 18

The interquartile range is

Accepted Answer

A) the 50th percentile 
B) another name for the variance 
C) the difference between the largest and smallest values 
D) the difference between the third quartile and the first quartile 
A) the 50th percentile 
B) another name for the variance 
C) the difference between the largest and smallest values 
D) the difference between the third quartile and the first quartile

Question 19

Consider a sample with the following data values.
   
Compute the Z scores for the above five observations.

Accepted Answer

Mean = 434

Question 20

From a population of size 400,a random sample of 40 items is selected.The median of the sample

Accepted Answer

A) must be 200,since 400 divided by 2 is 200 
B) must be 10,since 400 divided by 400 is 10 
C) must be equal to the median of population,if the sample is truly random 
D) None of these alternatives is correct. 
A) must be 200,since 400 divided by 2 is 200 
B) must be 10,since 400 divided by 400 is 10 
C) must be equal to the median of population,if the sample is truly random 
D) None of these alternatives is correct.

The standard deviation of a sample was reported to be 20.The report indicated that = 7200.What has been the sample size?

The coefficient of correlation ranges between

A group of students had dinner at a local restaurant.The total bill for the dinner was $414.70.Each student paid his/her equal share of the bill,which was $18.85.How many student's were at the dinner?

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4.The mean is

The weights (in pounds)of a sample of 36 individuals were recorded and the following statistics were calculated. The coefficient of variation equals

Exhibit 3-3 A researcher has collected the following sample data.The mean of the sample is 5. -Refer to Exhibit 3-3.The coefficient of variation is

The 50th percentile is the

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6.The variance is

The numerical value of the variance

The following data represent the daily demand (y in thousands of units)and the unit price (x in dollars)for a product. a.Compute and interpret the sample covariance for the above data. b.Compute and interpret the sample correlation coefficient.

The following frequency distribution shows the ACT scores of a sample of students: For the above data,compute the following. a.The mean b.The standard deviation

The amount of time that a sample of students spends watching television per day is given below. a.Compute the mean. b.Compute the median. c.Compute the standard deviation. d.Compute the 75th percentile.

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

The variance of the sample

The first quartile

The interquartile range is

Consider a sample with the following data values. Compute the Z scores for the above five observations.

From a population of size 400,a random sample of 40 items is selected.The median of the sample

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 standard deviation of a sample was reported to be 20.The report indicated that = 7200.What has been the sample size?

The coefficient of correlation ranges between

A group of students had dinner at a local restaurant.The total bill for the dinner was $414.70.Each student paid his/her equal share of the bill,which was $18.85.How many student's were at the dinner?

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4.The mean is

The weights (in pounds)of a sample of 36 individuals were recorded and the following statistics were calculated. The coefficient of variation equals

Exhibit 3-3 A researcher has collected the following sample data.The mean of the sample is 5. -Refer to Exhibit 3-3.The coefficient of variation is

The 50th percentile is the

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6.The variance is

The numerical value of the variance

The following data represent the daily demand (y in thousands of units)and the unit price (x in dollars)for a product. a.Compute and interpret the sample covariance for the above data. b.Compute and interpret the sample correlation coefficient.

The following frequency distribution shows the ACT scores of a sample of students: For the above data,compute the following. a.The mean b.The standard deviation

The amount of time that a sample of students spends watching television per day is given below. a.Compute the mean. b.Compute the median. c.Compute the standard deviation. d.Compute the 75th percentile.

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

The variance of the sample

The first quartile

The interquartile range is

Consider a sample with the following data values. Compute the Z scores for the above five observations.

From a population of size 400,a random sample of 40 items is selected.The median of the sample

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