Question 1

If the coefficient of correlation r = $\pm$1, then the best-fit linear equation will actually include all of the observations.

Accepted Answer

A) True 
 B)False

Question 2

What statistics and graphs can you use to answer the following question: Where is the approximate center of the distribution?

Accepted Answer

The median is a better measure of center

Question 3

The value of the mean times the number of observations equals the sum of the observations.

Accepted Answer

A) True 
 B)False

Question 4

The Y-intercept, b0, of the least squares line $\tilde { y } = b _ { 0 } + b _ { 1 } x$ represents the:

Accepted Answer

A) estimated average 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 sample regression line. 
A) estimated average 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 sample regression line.

Question 5

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

Question 6

If the standard deviation of x is 18, the covariance of x and y is 120, the coefficient r = 0.90, then the standard deviation of y is 54.87.

Accepted Answer

A) True 
 B)False

Question 7

NARRBEGIN: Weights of Police Officer
Weights of Police Officers
The following data represent the weights in pounds of a sample of 25 police officers: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.NARREND
-{Weights of Police Officers Narrative} Construct a relative frequency histogram for the data, using five class intervals and the value 130 as the lower limit of the first class.

Accepted Answer

The answer of NARRBEGIN: Weights of Police Officer
Weights of Police...

Question 8

The ____________________ is the least effective of all the measures of variability.

Accepted Answer

The answer of The ____________________ is the least effective of...

Question 9

Which of the following statements is true?

Accepted Answer

A) The lower or first quartile is labeled Q1 and is equal to the 25th percentile. 
B) The second quartile is labeled Q2 and is equal to the median. 
C) The upper or third quartile is labeled Q3 and is equal to the 75th percentile. 
D) All of these choices are true. 
A) The lower or first quartile is labeled Q1 and is equal to the 25th percentile. 
B) The second quartile is labeled Q2 and is equal to the median. 
C) The upper or third quartile is labeled Q3 and is equal to the 75th percentile. 
D) All of these choices are true.

Question 10

Percentiles can be converted into quintiles and deciles, where quintiles divide the data into fifths and deciles divide the data into tenths.

Accepted Answer

A) True 
 B)False

Question 11

NARRBEGIN: Credit Hours
Credit Hours
The College of Business at The State University of California produced 3,400 credit hours during Spring Semester, 2011he number and percentage of credit hours produced by each of the four departments in the College of Business is shown below. $$\begin{array} { | l | c c | } 
\hline \text { Department } & \text { Percent } & \text { Count } \
\hline \text { Marketing } & 35.3 & 1.200 \
\text { Management } & 23.5 & 800 \
\text { Finance } & 23.5 & 800 \
\text { Accounting } & 17.6 & 600 \
\hline
\end{array}$$ The following three-dimensional pie chart was constructed from the table above.   NARREND
-Briefly explain why the histogram below is misleading.

Accepted Answer

The scale on the Y-axis has be

Question 12

The denominator in the calculation of the sample covariance, cov (x,y), is:

Accepted Answer

A) n - 2 
B) n -1 
C) n 
D) 2n - 1 
A) n - 2 
B) n -1 
C) n 
D) 2n - 1

Question 13

If the distribution of a data set were perfectly symmetric, the distance from Q1 to the median would always equal the distance from Q3 to the median in a box plot.

Accepted Answer

A) True 
 B)False

Question 14

NARRBEGIN: 2-Year Investment
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.NARREND
-{2-Year Investment Narrative} Compare the values of the arithmetic and geometric means.

Accepted Answer

Because there was no change in the value

Question 15

If the correlation coefficient r = 1.00, then all the observations must fall exactly on:

Accepted Answer

A) a straight line with a slope that equals 1.00. 
B) a straight line with a negative slope. 
C) a straight line with a positive slope. 
D) a horizontal straight line with a zero slope. 
A) a straight line with a slope that equals 1.00. 
B) a straight line with a negative slope. 
C) a straight line with a positive slope. 
D) a horizontal straight line with a zero slope.

Question 16

____________________ are extremely large or extremely small observations.

Accepted Answer

The answer of ____________________ are extremely large or extremely small...

Question 17

NARRBEGIN: Ages of Senior Citizens
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.NARREND
-{Ages of Senior Citizens Narrative} Calculate the mean age of the uninsured senior citizens

Accepted Answer

The answer of NARRBEGIN: Ages of Senior Citizens
Ages of Senior...

Question 18

The ____________________ measures the spread between the middle 50% of the observations.

Accepted Answer

The answer of The ____________________ measures the spread between the...

Question 19

Given the following sample data:
 $$\begin{array} { | l | l l l l l l l l l l | } 
\hline \boldsymbol { x } & 420 & 610 & 625 & 500 & 400 & 450 & 550 & 650 & 480 & 565 \
\hline y & 2.80 & 3.60 & 3.75 & 3.00 & 2.50 & 2.70 & 3.50 & 3.90 & 2.95 & 3.30 \
\hline
\end{array}$$ 
a.Calculate the covariance and the correlation coefficient.
b.Comment on the relationship between x and y.
c.Determine the least squares line.
d.Draw the scatter diagram and plot the least squares line.

Accepted Answer

a. b.There is a very strong po

Question 20

NARRBEGIN: Milk Demand
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.NARREND
-{Milk Demand Narrative} If the supermarket begins each morning with a supply of 67 containers of milk, how often will demand exceed the supply? (Give a percentage.)

Accepted Answer

Approximat

If the coefficient of correlation r = $\pm$ 1, then the best-fit linear equation will actually include all of the observations.

What statistics and graphs can you use to answer the following question: Where is the approximate center of the distribution?

The value of the mean times the number of observations equals the sum of the observations.

The Y-intercept, b₀, of the least squares line $\tilde { y } = b _ { 0 } + b _ { 1 } x$ represents the:

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

If the standard deviation of x is 18, the covariance of x and y is 120, the coefficient r = 0.90, then the standard deviation of y is 54.87.

The ____________________ is the least effective of all the measures of variability.

Which of the following statements is true?

Percentiles can be converted into quintiles and deciles, where quintiles divide the data into fifths and deciles divide the data into tenths.

The denominator in the calculation of the sample covariance, cov (x,y), is:

If the distribution of a data set were perfectly symmetric, the distance from Q₁ to the median would always equal the distance from Q₃ to the median in a box plot.

If the correlation coefficient r = 1.00, then all the observations must fall exactly on:

____________________ are extremely large or extremely small observations.

The ____________________ measures the spread between the middle 50% of the observations.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

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 Optional

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 4: Numerical Descriptive Techniques

If the coefficient of correlation r = ±\pm± 1, then the best-fit linear equation will actually include all of the observations.

What statistics and graphs can you use to answer the following question: Where is the approximate center of the distribution?

The value of the mean times the number of observations equals the sum of the observations.

The Y-intercept, b0, of the least squares line y~=b0+b1x\tilde { y } = b _ { 0 } + b _ { 1 } xy~​=b0​+b1​x represents the:

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

If the standard deviation of x is 18, the covariance of x and y is 120, the coefficient r = 0.90, then the standard deviation of y is 54.87.

The ____________________ is the least effective of all the measures of variability.

Which of the following statements is true?

Percentiles can be converted into quintiles and deciles, where quintiles divide the data into fifths and deciles divide the data into tenths.

The denominator in the calculation of the sample covariance, cov (x,y), is:

If the distribution of a data set were perfectly symmetric, the distance from Q1 to the median would always equal the distance from Q3 to the median in a box plot.

If the correlation coefficient r = 1.00, then all the observations must fall exactly on:

____________________ are extremely large or extremely small observations.

The ____________________ measures the spread between the middle 50% of the observations.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

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 Optional

Simple Linear Regression and Correlation

Multiple Regression

Filters

If the coefficient of correlation r = $\pm$ 1, then the best-fit linear equation will actually include all of the observations.

The Y-intercept, b₀, of the least squares line $\tilde { y } = b _ { 0 } + b _ { 1 } x$ represents the:

If the distribution of a data set were perfectly symmetric, the distance from Q₁ to the median would always equal the distance from Q₃ to the median in a box plot.