Question 1

Which of the following is not a measure of variability?

Accepted Answer

A) interquartile range 
B) variance 
C) weighted mean 
D) range 
A) interquartile range 
B) variance 
C) weighted mean 
D) range

Question 2

For continuous numerical unimodal data,the mean is usually less than the median in a skewed-left distribution,and greater than the median in a skewed-right distribution.

Accepted Answer

A) True 
 B)False

Question 3

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A set of data is mounded,with a mean of 500 and a variance of 576.
-Approximately what proportion of the observations is between 476 and 524?

Accepted Answer

The values 476 and 524 are wit

Question 4

Determine if there exists a relationship between the size of the sales force and gross sales.

Accepted Answer

A useful rule of thumb is that a relatio

Question 5

The covariance measures the direction and strength of any relationship between two variables.

Accepted Answer

A) True 
 B)False

Question 6

The supervisor of a tourist information desk at a local airport is interested in how long it takes an employee to serve a customer.Using a stopwatch,he measures the amount of time it takes for each of 10 customers.These times,measured in minutes,are reported as follows: 2.3,1.5,3.9,0.6,2.7,3.1,2.8,0.9,1.4,and 2.6.Calculate the standard deviation and the interquartile range.

Accepted Answer

Standard deviation =

Question 7

When the data values are arranged in an ascending order,the third quartile (Q3)is located at the   
position,and first quartile (Q1)is located at the   
position.

Accepted Answer

A) True 
 B)False

Question 8

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Production records for an automobile manufacturer show the following figures for production per shift (maximum production is 720 cars per shift):
  
-Find the mean.

Accepted Answer

@#IMG-DLM& 
= @#IMG-DLM& = 177

Question 9

In nearly all situations,we would compute skewness with a statistical software package or Excel.

Accepted Answer

A) True 
 B)False

Question 10

For which measure of central location will the sum of the deviations of each data value from that measure always be zero?

Accepted Answer

A) arithmetic mean 
B) geometric mean 
C) median 
D) mode 
A) arithmetic mean 
B) geometric mean 
C) median 
D) mode

Question 11

A sample has a mean of 100.0 and a standard deviation of 15.0.According to Chebyshev's Theorem,at least 8/9 of all of the data will lie between what two values?

Accepted Answer

The answer of A sample has a mean of 100.0...

Question 12

Which one of the values below represents the third quartile of the data set 10,12,16,7,9,7,41,and 14?

Accepted Answer

A) 8.0 
B) 15.5 
C) 7.0 
D) 24.0 
A) 8.0 
B) 15.5 
C) 7.0 
D) 24.0

Question 13

The standard deviation of the number of miles driven by the ten employees is:

Accepted Answer

The answer of The standard deviation of the number of...

Question 14

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The police lieutenant in charge of the traffic division has reviewed the number of traffic citations issued per day by each of the 10 police officers in his division.The data were: 13,21,12,34,31,13,22,26,25,and 23.
-What is the interquartile range for the number of citations issued per day?

Accepted Answer

Location of Q₃ = 0.75(n + 1)= 0

Question 15

The average score for a class of 35 students was 70.The 20 male students in the class averaged 73.What was the average score for the 15 female students in the class?

Accepted Answer

A) 73 
B) 70 
C) 66 
D) 60 
A) 73 
B) 70 
C) 66 
D) 60

Question 16

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Consider the following (x,y)sample data:
(24,24),(19,33),(21,31),(10,36),(22,30),(13,36),(21,32),(23,26),(20,26),and
(21,31).
-Compute and interpret the sample correlation coefficient.

Accepted Answer

The sample correlation coeffic

Question 17

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Consider the following (x,y)sample data: (53,37),(34,26),(10,29),(63,55),(28,36),(58,48),(28,41),(50,42),(39,21),and (35,46).
-Calculate the variances   
and   
and the covariance sxy of the sample data.

Accepted Answer

@#IMG-DLM& 
= 263.51

Question 18

Three persons earn $9 an hour,five earn $10 an hour,and one earns $13 an hour.The weighted mean hourly wage is $10.

Accepted Answer

A) True 
 B)False

Question 19

A question in a survey asks for a respondent's favorite sport.Which measure of central tendency should be used to summarize this question?

Accepted Answer

A) arithmetic mean 
B) geometric mean 
C) median 
D) mode 
A) arithmetic mean 
B) geometric mean 
C) median 
D) mode

Question 20

Why is it necessary for a measure of variation to accompany a measure of central tendency?

Accepted Answer

A measure of central tendency alone does

Which of the following is not a measure of variability?

For continuous numerical unimodal data,the mean is usually less than the median in a skewed-left distribution,and greater than the median in a skewed-right distribution.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A set of data is mounded,with a mean of 500 and a variance of 576. -Approximately what proportion of the observations is between 476 and 524?

Determine if there exists a relationship between the size of the sales force and gross sales.

The covariance measures the direction and strength of any relationship between two variables.

When the data values are arranged in an ascending order,the third quartile (Q₃)is located at the position,and first quartile (Q₁)is located at the position.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Production records for an automobile manufacturer show the following figures for production per shift (maximum production is 720 cars per shift): -Find the mean.

In nearly all situations,we would compute skewness with a statistical software package or Excel.

For which measure of central location will the sum of the deviations of each data value from that measure always be zero?

A sample has a mean of 100.0 and a standard deviation of 15.0.According to Chebyshev's Theorem,at least 8/9 of all of the data will lie between what two values?

Which one of the values below represents the third quartile of the data set 10,12,16,7,9,7,41,and 14?

The standard deviation of the number of miles driven by the ten employees is:

The average score for a class of 35 students was 70.The 20 male students in the class averaged 73.What was the average score for the 15 female students in the class?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (24,24),(19,33),(21,31),(10,36),(22,30),(13,36),(21,32),(23,26),(20,26),and (21,31). -Compute and interpret the sample correlation coefficient.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (53,37),(34,26),(10,29),(63,55),(28,36),(58,48),(28,41),(50,42),(39,21),and (35,46). -Calculate the variances and and the covariance s_xy of the sample data.

Three persons earn $9 an hour,five earn $10 an hour,and one earns $13 an hour.The weighted mean hourly wage is $10.

A question in a survey asks for a respondent's favorite sport.Which measure of central tendency should be used to summarize this question?

Why is it necessary for a measure of variation to accompany a measure of central tendency?

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

Exam 2: Describing Data: Numerical

Which of the following is not a measure of variability?

For continuous numerical unimodal data,the mean is usually less than the median in a skewed-left distribution,and greater than the median in a skewed-right distribution.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A set of data is mounded,with a mean of 500 and a variance of 576. -Approximately what proportion of the observations is between 476 and 524?

Determine if there exists a relationship between the size of the sales force and gross sales.

The covariance measures the direction and strength of any relationship between two variables.

When the data values are arranged in an ascending order,the third quartile (Q3)is located at the position,and first quartile (Q1)is located at the position.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Production records for an automobile manufacturer show the following figures for production per shift (maximum production is 720 cars per shift): -Find the mean.

In nearly all situations,we would compute skewness with a statistical software package or Excel.

For which measure of central location will the sum of the deviations of each data value from that measure always be zero?

A sample has a mean of 100.0 and a standard deviation of 15.0.According to Chebyshev's Theorem,at least 8/9 of all of the data will lie between what two values?

Which one of the values below represents the third quartile of the data set 10,12,16,7,9,7,41,and 14?

The standard deviation of the number of miles driven by the ten employees is:

The average score for a class of 35 students was 70.The 20 male students in the class averaged 73.What was the average score for the 15 female students in the class?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (24,24),(19,33),(21,31),(10,36),(22,30),(13,36),(21,32),(23,26),(20,26),and (21,31). -Compute and interpret the sample correlation coefficient.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (53,37),(34,26),(10,29),(63,55),(28,36),(58,48),(28,41),(50,42),(39,21),and (35,46). -Calculate the variances and and the covariance sxy of the sample data.

Three persons earn $9 an hour,five earn $10 an hour,and one earns $13 an hour.The weighted mean hourly wage is $10.

A question in a survey asks for a respondent's favorite sport.Which measure of central tendency should be used to summarize this question?

Why is it necessary for a measure of variation to accompany a measure of central tendency?

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

When the data values are arranged in an ascending order,the third quartile (Q₃)is located at the position,and first quartile (Q₁)is located at the position.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (53,37),(34,26),(10,29),(63,55),(28,36),(58,48),(28,41),(50,42),(39,21),and (35,46). -Calculate the variances and and the covariance s_xy of the sample data.