Question 1

Which of the following types of data has no measure of variability?

Accepted Answer

A) Interval data. 
B) Nominal data. 
C) Bimodal data. 
D) None of these choices. 
A) Interval data. 
B) Nominal data. 
C) Bimodal data. 
D) None of these choices.

Question 2

Which of the following is a measure of variability?

Accepted Answer

A) The interquartile range. 
B) The variance. 
C) The coefficient of variation. 
D) All of these choices are true. 
A) The interquartile range. 
B) The variance. 
C) The coefficient of variation. 
D) All of these choices are true.

Question 3

What statistics and graphs can you use to look for a relationship between two interval variables?

Accepted Answer

Scatter diagrams,covariance,th

Question 4

There are three statistics used to measure variability in a data set; the range,the ____________________,and the ____________________.

Accepted Answer

variance; standard d

Question 5

If two data sets have the same range:

Accepted Answer

A) the distances from the smallest to largest observations in both sets will be the same. 
B) the smallest and largest observations are the same in both sets. 
C) both sets will have the same standard deviation. 
D) both sets will have the same interquartile range. 
A) the distances from the smallest to largest observations in both sets will be the same. 
B) the smallest and largest observations are the same in both sets. 
C) both sets will have the same standard deviation. 
D) both sets will have the same interquartile range.

Question 6

In a perfectly symmetric distribution,which of the following statements is false?

Accepted Answer

A) The distance from Q1 to Q2 equals to the distance from Q2 to Q3. 
B) The distance from the smallest observation to Q1 is the same as the distance from Q3 to the largest observation. 
C) The distance from the smallest observation to Q2 is the same as the distance from Q2 to the largest observation. 
D) The distance from Q1 to Q3 is half of the distance from the smallest to the largest observation. 
A) The distance from Q1 to Q2 equals to the distance from Q2 to Q3. 
B) The distance from the smallest observation to Q1 is the same as the distance from Q3 to the largest observation. 
C) The distance from the smallest observation to Q2 is the same as the distance from Q2 to the largest observation. 
D) The distance from Q1 to Q3 is half of the distance from the smallest to the largest observation.

Question 7

A perfect straight line sloping downward would produce a correlation coefficient equal to:

Accepted Answer

A) +1.0 
B) −1.0 
C) 0.0 
D) Cannot tell from the information given. 
A) +1.0 
B) −1.0 
C) 0.0 
D) Cannot tell from the information given.

Question 8

A perfect straight line sloping upward would produce a correlation coefficient value of 1.0.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is a property of r,the coefficient of correlation?

Accepted Answer

A) r always lies between 0 and 1. 
B) r has no units. 
C) If you switch the values of X and Y,the sign of r changes. 
D) All of these choices are true. 
A) r always lies between 0 and 1. 
B) r has no units. 
C) If you switch the values of X and Y,the sign of r changes. 
D) All of these choices are true.

Question 10

The slope b1 of the least squares line   represents the:

Accepted Answer

A) predicted value of Y when X = 0. 
B) estimated average change in Y per unit change in X. 
C) predicted value of Y. 
D) variation around the regression line. 
A) predicted value of Y when X = 0. 
B) estimated average change in Y per unit change in X. 
C) predicted value of Y. 
D) variation around the regression line.

Question 11

Ages of Senior Citizens ​ A sociologist recently conducted a survey of citizens over 65 years of age whose net worth is too high to qualify for Medicaid and who have no private health insurance.The ages of 22 uninsured senior citizens were as follows: 65,66,67,68,69,70,71,73,74,75,76,77,78,79,80,81,86,87,91,92, 94,and 97. ​ ​
-{Ages of Senior Citizens Narrative} Explain why there is no mode for this data set.

Accepted Answer

There is n

Question 12

2-Year Investment ​ Suppose you make a 2-year investment of $5,000 and it grows by 100% to $10,000 during the first year.During the second year,however,the investment suffers a 50% loss,from $10,000 back to $5,000. ​ ​
-{2-Year Investment Narrative} Calculate the arithmetic mean.

Accepted Answer

The answer of  2-Year Investment ​ Suppose you make...

Question 13

Salaries of Employees ​ The following data represent the yearly salaries (in thousands of dollars)of a sample of 13 employees of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. ​ ​
-{Salaries of Employees Narrative} Compute the median salary.

Accepted Answer

median = 2

Question 14

A statistic that interprets the standard deviation relative to the size of the numbers in the data set is called the ____________________ of ____________________.

Accepted Answer

coefficien

Question 15

Computers ​ The following data represent the number of computers owned by a sample of 10 families from Chicago: 4,2,1,1,5,3,0,1,0,and 2. ​ ​
-{Computers Narrative} Is the distribution of the number of computers symmetric or skewed? Why?

Accepted Answer

The distribution is

Question 16

The mean of fifty sales receipts is $65.75 and the standard deviation is $10.55.Using Chebysheff's Theorem,75% of the sales receipts were between $44.65 and $86.85.

Accepted Answer

A) True 
 B)False

Question 17

Milk Demand ​ A supermarket has determined that daily demand for milk containers has an approximate bell shaped distribution,with a mean of 55 containers and a standard deviation of six containers. ​ ​
-{Milk Demand Narrative} How often can we expect between 49 and 61 containers to be sold in a day? (Give a percentage.)

Accepted Answer

Approximat

Question 18

Longevity and Salary A sample of eight observations of variables x (years of experience)and y (salary in $1,000s)is shown below:   ​ ​
-{Longevity and Salary Narrative}
a.Calculate the coefficient of correlation,and comment on the relationship between x and y.
b.Give a possible reason that the correlation is negative.

Accepted Answer

​ a. @#IMG-DLM& ​ There is a very strong (almost p

Question 19

Salaries of Office Workers ​ The following data represent the salaries (in thousands of dollars)of a sample of 13 office workers of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. ​ ​
-{Salaries of Office Workers Narrative} Compute the coefficient of variation and express the number in the appropriate unit.

Accepted Answer

cv = 2.664 thousand

Question 20

If two data sets have the same range,the distances from the smallest to largest observations in both sets will be the same.

Accepted Answer

A) True 
 B)False

Which of the following types of data has no measure of variability?

Which of the following is a measure of variability?

What statistics and graphs can you use to look for a relationship between two interval variables?

There are three statistics used to measure variability in a data set; the range,the ,and the .

If two data sets have the same range:

In a perfectly symmetric distribution,which of the following statements is false?

A perfect straight line sloping downward would produce a correlation coefficient equal to:

A perfect straight line sloping upward would produce a correlation coefficient value of 1.0.

Which of the following is a property of r,the coefficient of correlation?

The slope b₁ of the least squares line represents the:

2-Year Investment Suppose you make a 2-year investment of $5,000 and it grows by 100% to $10,000 during the first year.During the second year,however,the investment suffers a 50% loss,from $10,000 back to $5,000. -{2-Year Investment Narrative} Calculate the arithmetic mean.

Salaries of Employees The following data represent the yearly salaries (in thousands of dollars)of a sample of 13 employees of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -{Salaries of Employees Narrative} Compute the median salary.

A statistic that interprets the standard deviation relative to the size of the numbers in the data set is called the of .

Computers The following data represent the number of computers owned by a sample of 10 families from Chicago: 4,2,1,1,5,3,0,1,0,and 2. -{Computers Narrative} Is the distribution of the number of computers symmetric or skewed? Why?

The mean of fifty sales receipts is $65.75 and the standard deviation is $10.55.Using Chebysheff's Theorem,75% of the sales receipts were between $44.65 and $86.85.

If two data sets have the same range,the distances from the smallest to largest observations in both sets will be the same.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

Exam 4: Numerical Descriptive Techniques

Which of the following types of data has no measure of variability?

Which of the following is a measure of variability?

What statistics and graphs can you use to look for a relationship between two interval variables?

There are three statistics used to measure variability in a data set; the range,the ____________________,and the ____________________.

If two data sets have the same range:

In a perfectly symmetric distribution,which of the following statements is false?

A perfect straight line sloping downward would produce a correlation coefficient equal to:

A perfect straight line sloping upward would produce a correlation coefficient value of 1.0.

Which of the following is a property of r,the coefficient of correlation?

The slope b1 of the least squares line represents the:

2-Year Investment ​ Suppose you make a 2-year investment of $5,000 and it grows by 100% to $10,000 during the first year.During the second year,however,the investment suffers a 50% loss,from $10,000 back to $5,000. ​ ​ -{2-Year Investment Narrative} Calculate the arithmetic mean.

Salaries of Employees ​ The following data represent the yearly salaries (in thousands of dollars)of a sample of 13 employees of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. ​ ​ -{Salaries of Employees Narrative} Compute the median salary.

A statistic that interprets the standard deviation relative to the size of the numbers in the data set is called the ____________________ of ____________________.

Computers ​ The following data represent the number of computers owned by a sample of 10 families from Chicago: 4,2,1,1,5,3,0,1,0,and 2. ​ ​ -{Computers Narrative} Is the distribution of the number of computers symmetric or skewed? Why?

The mean of fifty sales receipts is $65.75 and the standard deviation is $10.55.Using Chebysheff's Theorem,75% of the sales receipts were between $44.65 and $86.85.

If two data sets have the same range,the distances from the smallest to largest observations in both sets will be the same.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

There are three statistics used to measure variability in a data set; the range,the ,and the .

The slope b₁ of the least squares line represents the:

2-Year Investment Suppose you make a 2-year investment of $5,000 and it grows by 100% to $10,000 during the first year.During the second year,however,the investment suffers a 50% loss,from $10,000 back to $5,000. -{2-Year Investment Narrative} Calculate the arithmetic mean.

Salaries of Employees The following data represent the yearly salaries (in thousands of dollars)of a sample of 13 employees of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -{Salaries of Employees Narrative} Compute the median salary.

A statistic that interprets the standard deviation relative to the size of the numbers in the data set is called the of .

Computers The following data represent the number of computers owned by a sample of 10 families from Chicago: 4,2,1,1,5,3,0,1,0,and 2. -{Computers Narrative} Is the distribution of the number of computers symmetric or skewed? Why?