Question 1

Suppose a sample of size 50 has a sample mean of 20.In this case,the sum of all observations in the sample is 1,000.

Accepted Answer

A) True 
 B)False

Question 2

The ____________________ of the correlation indicates the direction of a linear relationship.

Accepted Answer

The answer of The ____________________ of the correlation indicates the...

Question 3

Hours Worked per Week ​ The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53, 27,36,35,and 20. ​ ​
-{Hours Worked per Week Narrative} Find the median hours.

Accepted Answer

The answer of  Hours Worked per Week ​ The...

Question 4

Ages of Jockeys ​ The following data represent the ages in years of a sample of 25 jockeys from a local race track: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20. ​ ​
-{Ages of Jockeys Narrative} Compute the interquartile range of the data and interpret its meaning.

Accepted Answer

The answer of  Ages of Jockeys ​ The following...

Question 5

Quartiles divide the observations in a data set into four parts with the same amount of data in each part.

Accepted Answer

A) True 
 B)False

Question 6

Ages of Retirees ​ A sociologist recently conducted a survey of retirees 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 20 uninsured retirees were as follows: 65,66,67,68,69,70,71,73,74,75,78,79,80,81,86,87,91,92,94,and 97. ​ ​
-{Ages of Retirees Narrative} Describe the shape of the distribution of ages by comparing the quartiles.

Accepted Answer

The answer of Ages of Retirees ​ A sociologist recently...

Question 7

____________________ uses both the mean and the standard deviation to interpret standard deviation for histograms of any shape.

Accepted Answer

The answer of ____________________ uses both the mean and the...

Question 8

Pets Survey A sample of 36 families were asked how many pets they owned.Their responses are summarized in the following table.  ​ ​
-{Pets Survey Narrative} Determine the mean,the median,and the mode of the number of pets owned per family.

Accepted Answer

The answer of Pets Survey A sample of 36 families...

Question 9

In a histogram,the proportion of the total area which must be to the left of the median is less than 0.50 if the distribution is negatively skewed.

Accepted Answer

A) True 
 B)False

Question 10

The interquartile range is an interval of numbers starting at Q1 and ending at Q3.

Accepted Answer

A) True 
 B)False

Question 11

Ages of Retirees ​ A sociologist recently conducted a survey of retirees 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 20 uninsured retirees were as follows: 65,66,67,68,69,70,71,73,74,75,78,79,80,81,86,87,91,92,94,and 97. ​ ​
-{Ages of Retirees Narrative} Calculate the first quartile of the ages of the uninsured retirees.

Accepted Answer

The answer of Ages of Retirees ​ A sociologist recently...

Question 12

In a histogram,the proportion of the total area which must be to the right of the mean is:

Accepted Answer

A) less than 0.50 if the distribution is negatively skewed. 
B) exactly 0.50. 
C) more than 0.50 if the distribution is positively skewed. 
D) exactly 0.50 if the distribution is symmetric and unimodal.

Question 13

Strip Mall Rent ​ Monthly rent data in dollars for a sample of 10 stores in a small town in South Dakota are as follows: 220,216,220,205,210,240,195,235,204,and 250. ​ ​
-{Strip Mall Rent Narrative} What is the mode?

Accepted Answer

The answer of Strip Mall Rent ​ Monthly rent data...

Question 14

If the coefficient of correlation r = −.81,the standard deviations of x and y are 20 and 25,respectively,then cov(x,y)must be −405.0.

Accepted Answer

A) True 
 B)False

Question 15

The Empirical Rule states that the approximate percentage of measurements in a data set (providing that the data set has a bell shaped distribution)that fall within two standard deviations of their mean is approximately:

Accepted Answer

A) 68%. 
B) 75%. 
C) 95%. 
D) 99%.

Question 16

Which of the following is correct about the shape of a distribution?

Accepted Answer

A) The shape can show you how many modes there are. 
B) The shape can help you determine the approximate center of the distribution. 
C) The shape can help you determine whether the data are close or spread out. 
D) All of these choices are true.

Question 17

The middle line inside the box in a box plot represents the ____________________.

Accepted Answer

The answer of The middle line inside the box in...

Question 18

The horizontal lines extending to the left and to the right of the box in a box plot are called ____________________.

Accepted Answer

The answer of The horizontal lines extending to the left...

Question 19

The strength of the linear relationship between two interval variables can be measured by the:

Accepted Answer

A) coefficient of variation. 
B) coefficient of correlation. 
C) slope of the regression line. 
D) Y-intercept.

Question 20

Yearly Donations ​ 
The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 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. ​ ​
-{Yearly Donations Narrative} Compute the upper quartile.

Accepted Answer

The answer of  Yearly Donations ​ 
The following data...

Exam 4: Numerical Descriptive Techniques

Suppose a sample of size 50 has a sample mean of 20.In this case,the sum of all observations in the sample is 1,000.

The ____________________ of the correlation indicates the direction of a linear relationship.

Hours Worked per Week The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53, 27,36,35,and 20. -{Hours Worked per Week Narrative} Find the median hours.

Ages of Jockeys The following data represent the ages in years of a sample of 25 jockeys from a local race track: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20. -{Ages of Jockeys Narrative} Compute the interquartile range of the data and interpret its meaning.

Quartiles divide the observations in a data set into four parts with the same amount of data in each part.

____________________ uses both the mean and the standard deviation to interpret standard deviation for histograms of any shape.

Pets Survey A sample of 36 families were asked how many pets they owned.Their responses are summarized in the following table. -{Pets Survey Narrative} Determine the mean,the median,and the mode of the number of pets owned per family.

In a histogram,the proportion of the total area which must be to the left of the median is less than 0.50 if the distribution is negatively skewed.

The interquartile range is an interval of numbers starting at Q₁ and ending at Q₃.

In a histogram,the proportion of the total area which must be to the right of the mean is:

Strip Mall Rent Monthly rent data in dollars for a sample of 10 stores in a small town in South Dakota are as follows: 220,216,220,205,210,240,195,235,204,and 250. -{Strip Mall Rent Narrative} What is the mode?

If the coefficient of correlation r = −.81,the standard deviations of x and y are 20 and 25,respectively,then cov(x,y)must be −405.0.

The Empirical Rule states that the approximate percentage of measurements in a data set (providing that the data set has a bell shaped distribution) that fall within two standard deviations of their mean is approximately:

Which of the following is correct about the shape of a distribution?

The middle line inside the box in a box plot represents the ____________________.

The horizontal lines extending to the left and to the right of the box in a box plot are called ____________________.

The strength of the linear relationship between two interval variables can be measured by the:

Yearly Donations The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 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. -{Yearly Donations Narrative} Compute the upper quartile.

Exam 4: Numerical Descriptive Techniques

Suppose a sample of size 50 has a sample mean of 20.In this case,the sum of all observations in the sample is 1,000.

The ____________________ of the correlation indicates the direction of a linear relationship.

Hours Worked per Week ​ The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53, 27,36,35,and 20. ​ ​ -{Hours Worked per Week Narrative} Find the median hours.

Quartiles divide the observations in a data set into four parts with the same amount of data in each part.

____________________ uses both the mean and the standard deviation to interpret standard deviation for histograms of any shape.

Pets Survey A sample of 36 families were asked how many pets they owned.Their responses are summarized in the following table. ​ ​ -{Pets Survey Narrative} Determine the mean,the median,and the mode of the number of pets owned per family.

In a histogram,the proportion of the total area which must be to the left of the median is less than 0.50 if the distribution is negatively skewed.

The interquartile range is an interval of numbers starting at Q1 and ending at Q3.

In a histogram,the proportion of the total area which must be to the right of the mean is:

Strip Mall Rent ​ Monthly rent data in dollars for a sample of 10 stores in a small town in South Dakota are as follows: 220,216,220,205,210,240,195,235,204,and 250. ​ ​ -{Strip Mall Rent Narrative} What is the mode?

If the coefficient of correlation r = −.81,the standard deviations of x and y are 20 and 25,respectively,then cov(x,y)must be −405.0.

The Empirical Rule states that the approximate percentage of measurements in a data set (providing that the data set has a bell shaped distribution) that fall within two standard deviations of their mean is approximately:

Which of the following is correct about the shape of a distribution?

The middle line inside the box in a box plot represents the ____________________.

The horizontal lines extending to the left and to the right of the box in a box plot are called ____________________.

The strength of the linear relationship between two interval variables can be measured by the:

Yearly Donations ​ The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 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. ​ ​ -{Yearly Donations Narrative} Compute the upper quartile.

Hours Worked per Week The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53, 27,36,35,and 20. -{Hours Worked per Week Narrative} Find the median hours.

Pets Survey A sample of 36 families were asked how many pets they owned.Their responses are summarized in the following table. -{Pets Survey Narrative} Determine the mean,the median,and the mode of the number of pets owned per family.

The interquartile range is an interval of numbers starting at Q₁ and ending at Q₃.

Strip Mall Rent Monthly rent data in dollars for a sample of 10 stores in a small town in South Dakota are as follows: 220,216,220,205,210,240,195,235,204,and 250. -{Strip Mall Rent Narrative} What is the mode?

Yearly Donations The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 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. -{Yearly Donations Narrative} Compute the upper quartile.