Question 1

What is the standard deviation of their profit?

Accepted Answer

\[\begin{array} { l } 
\operatorname { V

Question 2

Would it be better for a customer buying a diamond to have a negative residual or a
positive residual from this model? Explain.

Accepted Answer

It would be better for customers to have

Question 3

One of your classmates is reading through the program for Friday night''s football game.
Among other things, the program lists the players'' positions and their weights. Your
classmate comments, "There is a strong correlation between a player's position and their
weight."
a. Explain why your classmate's statement is in error.
b. What other variable might be listed in the program that could be used to correctly
identify a correlation with weight?

Accepted Answer

a. Player position is a catego

Question 4

Describe to the board of directors an advantage and a disadvantage of using a 5% alpha
level of significance instead.

Accepted Answer

Advantage: the test would have greater p

Question 5

Describe a disadvantage of using volunteers in this study.

Accepted Answer

We are not able to g

Question 6

Write the transformed regression equation. Make sure to define any variables used in your
equation.

Accepted Answer

The answer of Write the transformed regression equation. Make sure...

Question 7

In a local school, vending machines offer a range of drinks from juices to sports drinks. The
purchasing agent thinks each type of drink is equally favored among the students buying
drinks from the machines. The recent purchasing choices from the vending machines are
shown in the table. $$\begin{array} { | c | c | c | c | c | } 
\hline \text { Drink Type/Flavor } & \begin{array} { c } 
\text { Lemon Lime } \
\text { Sports Drink }
\end{array} & \begin{array} { c } 
\text { Kiwi } \
\text { Strawberry }
\end{array} & \begin{array} { c } 
\text { Tropical } \
\text { Punch }
\end{array} & \begin{array} { c } 
\text { Grape } \
\text { Sports Drink }
\end{array} \
\hline \text { Frequency } & 159 & 198 & 174 & 149 \
\hline
\end{array}$$ 
a. Test an appropriate hypothesis to decide if the purchasing agent is correct. Give
statistical evidence to support your conclusion.
b. Which type of drink impacted your decision the most? Explain what this means in the
context of the problem.

Accepted Answer

a. We want to know if the types of drink

Question 8

An 8th grade class develops a linear model that predicts the number of cheerios (a small round cereal) that fit on the
circumference of a plate by using the diameter in inches. Their model is   = 0.56 + 5.11 (diameter )
-The slope of this model is best interpreted in context as…

Accepted Answer

A)  For every 1 inch of diameter, the circumference holds about 0.56 more cheerios. 
B)  A mistake, because π is about 3.14 and that should be the slope. 
C)  For every 1 inch of diameter, the circumference holds about 5.11 more cheerios. 
D)  For every 5.11 inches of diameter, the circumference is about 1 cheerio bigger. 
E)  It takes 5.11 cheerios to fill a plate's circumference. 
A)  For every 1 inch of diameter, the circumference holds about 0.56 more cheerios. 
B)  A mistake, because π is about 3.14 and that should be the slope. 
C)  For every 1 inch of diameter, the circumference holds about 5.11 more cheerios. 
D)  For every 5.11 inches of diameter, the circumference is about 1 cheerio bigger. 
E)  It takes 5.11 cheerios to fill a plate's circumference.

Question 9

Create and interpret a 90% confidence interval.

Accepted Answer

We wish to create an interval that is li

Question 10

What is the marginal distribution of milk consumption?

Accepted Answer

The answer of What is the marginal distribution of milk...

Question 11

Investigators at an agricultural research facility randomly assigned equal numbers of chickens to be housed in two rooms. In one room, the chickens experienced normal day/night cycles, while in the other room lights were left on 24 hours a day to see if those chickens would lay more eggs. After collecting data for several days the researchers tested the hypothesis $\mathrm { H } _ { 0 } : \mu _ { 1 } - \mu _ { 2 } = 0$ against the one-tail alternative and found $P = 0.22$. Which is true?

Accepted Answer

A)  none of these 
B)  The chickens in the lighted room averaged 0.22 more eggs per day 
C)  There's a 22% chance another experiment will give these same results. 
D)  There's a 22% chance that chickens housed in a lighted room produce more eggs. 
E)  There's a 22% chance that there's really no difference in egg production. 
A)  none of these 
B)  The chickens in the lighted room averaged 0.22 more eggs per day 
C)  There's a 22% chance another experiment will give these same results. 
D)  There's a 22% chance that chickens housed in a lighted room produce more eggs. 
E)  There's a 22% chance that there's really no difference in egg production.

Question 12

Food inspectors need to estimate the level of contaminants in food products packaged at a certain
Factory. Initial tests were based on a small sample but now the inspectors double the sample size for
A follow-up test. The main purpose of the larger sample is to…

Accepted Answer

A)  reduce non-response bias. 
B)  decrease the variability in the population. 
C)  decrease the standard deviation of the sampling model. 
D)  reduce confounding due to other variables. 
E)  reduce response bias. 
A)  reduce non-response bias. 
B)  decrease the variability in the population. 
C)  decrease the standard deviation of the sampling model. 
D)  reduce confounding due to other variables. 
E)  reduce response bias.

Question 13

List the variables. Indicate whether each variable is categorical or quantitative. If the
variable is quantitative, tell the units.

Accepted Answer

Categorical: taste, aftertaste, complian

Question 14

Name the sampling strategy in each plan.

Accepted Answer

a. cluster

Question 15

Write the company's null and alternative hypotheses.

Accepted Answer

The null hypothesis is that 19.5% of all

Question 16

Surprised by a high number of customers who purchased specialty pet clothing that day,
the owner decided that her 4% estimate must have been too low. How many clothing sales
would it have taken to convince you? Justify your answer.

Accepted Answer

Since @#LAT-DLM& and @#LAT-DLM&, we expect at least 10 succe

Question 17

We collect these data from 50 male students. Which variable is categorical?

Accepted Answer

A)  hours of homework last week 
B)  number of cigarettes smoked daily 
C)  number of TV sets at home 
D)  head circumference 
E)  eye color 
A)  hours of homework last week 
B)  number of cigarettes smoked daily 
C)  number of TV sets at home 
D)  head circumference 
E)  eye color

Question 18

Suppose that a Normal model describes the acidity (pH) of rainwater, and that water tested after
Last week's storm had a z-score of 1.8. This means that the acidity of that rain …

Accepted Answer

A)  had a pH 1.8 times that of average rainwater. 
B)  varied with a standard deviation of 1.8. 
C)  had a pH 1.8 higher than average rainfall. 
D)  had a pH of 1.8. 
E)  had a pH 1.8 standard deviations higher than that of average rainwater. 
A)  had a pH 1.8 times that of average rainwater. 
B)  varied with a standard deviation of 1.8. 
C)  had a pH 1.8 higher than average rainfall. 
D)  had a pH of 1.8. 
E)  had a pH 1.8 standard deviations higher than that of average rainwater.

Question 19

Explain the meaning of $R ^ { 2 }$ 
in the context of this problem.

Accepted Answer

@#LAT-DLM& 0% of the variation

Question 20

Which of the following are NOT characteristics of a good regression model?

Accepted Answer

A)  relatively small p-values for the F- and t-statistics 
B)  relatively few predictor variables 
C)  a relatively low value of s (the standard deviation of the residuals) 
D)  All of these are characteristics of a good regression model. 
E)  a relatively high R2 
A)  relatively small p-values for the F- and t-statistics 
B)  relatively few predictor variables 
C)  a relatively low value of s (the standard deviation of the residuals) 
D)  All of these are characteristics of a good regression model. 
E)  a relatively high R2

What is the standard deviation of their profit?

Would it be better for a customer buying a diamond to have a negative residual or a positive residual from this model? Explain.

Describe to the board of directors an advantage and a disadvantage of using a 5% alpha level of significance instead.

Describe a disadvantage of using volunteers in this study.

Write the transformed regression equation. Make sure to define any variables used in your equation.

An 8th grade class develops a linear model that predicts the number of cheerios (a small round cereal) that fit on the circumference of a plate by using the diameter in inches. Their model is = 0.56 + 5.11 (diameter ) -The slope of this model is best interpreted in context as…

Create and interpret a 90% confidence interval.

What is the marginal distribution of milk consumption?

Food inspectors need to estimate the level of contaminants in food products packaged at a certain Factory. Initial tests were based on a small sample but now the inspectors double the sample size for A follow-up test. The main purpose of the larger sample is to…

List the variables. Indicate whether each variable is categorical or quantitative. If the variable is quantitative, tell the units.

Name the sampling strategy in each plan.

Write the company's null and alternative hypotheses.

Surprised by a high number of customers who purchased specialty pet clothing that day, the owner decided that her 4% estimate must have been too low. How many clothing sales would it have taken to convince you? Justify your answer.

We collect these data from 50 male students. Which variable is categorical?

Suppose that a Normal model describes the acidity (pH) of rainwater, and that water tested after Last week's storm had a z-score of 1.8. This means that the acidity of that rain …

Explain the meaning of $R ^ { 2 }$ in the context of this problem.

Which of the following are NOT characteristics of a good regression model?

Exploring and Understanding Data

Exploring Relationships Between Variables

Gathering Data

Randomness and Probability

From the Data at Hand to the World at Large

Accessing Associations Between Variables

Inference When Variables Are Related

Filters

Exam 8: Regression, Associations, and Predictive Modeling

What is the standard deviation of their profit?

Would it be better for a customer buying a diamond to have a negative residual or a positive residual from this model? Explain.

Describe to the board of directors an advantage and a disadvantage of using a 5% alpha level of significance instead.

Describe a disadvantage of using volunteers in this study.

Write the transformed regression equation. Make sure to define any variables used in your equation.

An 8th grade class develops a linear model that predicts the number of cheerios (a small round cereal) that fit on the circumference of a plate by using the diameter in inches. Their model is = 0.56 + 5.11 (diameter ) -The slope of this model is best interpreted in context as…

Create and interpret a 90% confidence interval.

What is the marginal distribution of milk consumption?

Food inspectors need to estimate the level of contaminants in food products packaged at a certain Factory. Initial tests were based on a small sample but now the inspectors double the sample size for A follow-up test. The main purpose of the larger sample is to…

List the variables. Indicate whether each variable is categorical or quantitative. If the variable is quantitative, tell the units.

Name the sampling strategy in each plan.

Write the company's null and alternative hypotheses.

Surprised by a high number of customers who purchased specialty pet clothing that day, the owner decided that her 4% estimate must have been too low. How many clothing sales would it have taken to convince you? Justify your answer.

We collect these data from 50 male students. Which variable is categorical?

Suppose that a Normal model describes the acidity (pH) of rainwater, and that water tested after Last week's storm had a z-score of 1.8. This means that the acidity of that rain …

Explain the meaning of R2R ^ { 2 }R2 in the context of this problem.

Which of the following are NOT characteristics of a good regression model?

Exploring and Understanding Data

Exploring Relationships Between Variables

Gathering Data

Randomness and Probability

From the Data at Hand to the World at Large

Accessing Associations Between Variables

Inference When Variables Are Related

Filters

Explain the meaning of $R ^ { 2 }$ in the context of this problem.