STAT 211 EXAM STUDY QUESTIONS AND
100% CORRECT ANSWERS!!
In justifying his choice of a model, a student wrote, "I know this is the correct model
because Upper R^2=99.4%." Complete parts a and b below.
Question content area bottom
Part 1
a) Is this reasoning correct? Explain.
A.
Yes. A high Upper R^2 value means that a model is accurate.
B.
No. A high Upper R^2 value means that a model is inaccurate.
C.
Yes. The conditions for a model are satisfied because of the high Upper R^2 value.
D.
No. The scatterplot should be examined first to see if the conditions are satisfied.
Part 2
b) Does this model allow the student to make accurate predictions? Explain.
.A
Yes, the linear model should fit the data everywhere.
B.
Yes, a high Upper R^2 value always leads to accurate predictions.
C.
No, a high Upper R^2 value always leads to inaccurate predictions.
D.
No, the linear model might not fit the data everywhere.
1.
D. No. The scatterplot should be examined first to see if the conditions are satisfied.
2.
D. No, the linear model might not fit the data everywhere.
,If our data in a scatterplot is "straight enough" we can model our data with a _____.
linear model.
A student in an intro stats course collects data at her university. She wants to model the
relationship between student jobs and GPA. She collects a random sample of students and
asks each for their GPA and whether or not they have a job. If she wanted to make a
scatterplot and find a linear model, which condition has she violated?
Question content area bottom
Part 1
Choose the correct answer below.
A.
Quantitative Variables Condition
B.
Straight Enough Condition
C.
Outlier Condition
D.
No conditions have been violated; she should proceed with her model.
A. Quantitative Variables Condition
Determine if the statement below is true or false.
If the correlation between two variables is positive, the slope of the linear model will be
positive.
True
An analysis of the amount of fiber (in grams) and the potassium content (in milligrams) in
servings of 77 breakfast cereals produced the regression model ModifyingAbove Potassium
with Potassium =40+27Fiber. Explain what the slope means.
Question content area bottom
Part 1
Choose the correct answer below.
A.
, The model predicts that cereals will have approximately 27 more milligrams of potassium
for every additional gram of fiber.
B.
The model predicts that cereals will have approximately 40 more milligrams of potassium
for every additional gram of fiber.
C.
The model predicts that cereals will have approximately 40 more grams of fiber for every
additional milligram of potassium.
D.
The model predicts that cereals will have approximately 27 more grams of fiber for every
additional milligram of potassium.
A. The model predicts that cereals will have approximately 27 more milligrams of potassium for
every additional gram of fiber.
Administrators at Texas A&M University were interested in estimating the percentage of
students who are from aare from a bilingualbilingual family.family. nothing nothing The
A&M student body has about 42 comma 00042,000 members. How might the
administrators answer their question by applying the three Big Ideas?.
A.
The A&M administrators should take a survey. They should sample a part of the student
body, selecting respondents with a randomization method. They should be sure to draw a
sample of 20% of the student body.
B.
The A&M administrators should take a survey. They should sample a part of the student
body, selecting respondents with a randomization method. They should be sure to draw a
sufficiently large sample.
D.
The A&M administrators should take a survey. They should not use a random method of
selecting respondents. They should be sure to draw a sufficiently small sample.
100% CORRECT ANSWERS!!
In justifying his choice of a model, a student wrote, "I know this is the correct model
because Upper R^2=99.4%." Complete parts a and b below.
Question content area bottom
Part 1
a) Is this reasoning correct? Explain.
A.
Yes. A high Upper R^2 value means that a model is accurate.
B.
No. A high Upper R^2 value means that a model is inaccurate.
C.
Yes. The conditions for a model are satisfied because of the high Upper R^2 value.
D.
No. The scatterplot should be examined first to see if the conditions are satisfied.
Part 2
b) Does this model allow the student to make accurate predictions? Explain.
.A
Yes, the linear model should fit the data everywhere.
B.
Yes, a high Upper R^2 value always leads to accurate predictions.
C.
No, a high Upper R^2 value always leads to inaccurate predictions.
D.
No, the linear model might not fit the data everywhere.
1.
D. No. The scatterplot should be examined first to see if the conditions are satisfied.
2.
D. No, the linear model might not fit the data everywhere.
,If our data in a scatterplot is "straight enough" we can model our data with a _____.
linear model.
A student in an intro stats course collects data at her university. She wants to model the
relationship between student jobs and GPA. She collects a random sample of students and
asks each for their GPA and whether or not they have a job. If she wanted to make a
scatterplot and find a linear model, which condition has she violated?
Question content area bottom
Part 1
Choose the correct answer below.
A.
Quantitative Variables Condition
B.
Straight Enough Condition
C.
Outlier Condition
D.
No conditions have been violated; she should proceed with her model.
A. Quantitative Variables Condition
Determine if the statement below is true or false.
If the correlation between two variables is positive, the slope of the linear model will be
positive.
True
An analysis of the amount of fiber (in grams) and the potassium content (in milligrams) in
servings of 77 breakfast cereals produced the regression model ModifyingAbove Potassium
with Potassium =40+27Fiber. Explain what the slope means.
Question content area bottom
Part 1
Choose the correct answer below.
A.
, The model predicts that cereals will have approximately 27 more milligrams of potassium
for every additional gram of fiber.
B.
The model predicts that cereals will have approximately 40 more milligrams of potassium
for every additional gram of fiber.
C.
The model predicts that cereals will have approximately 40 more grams of fiber for every
additional milligram of potassium.
D.
The model predicts that cereals will have approximately 27 more grams of fiber for every
additional milligram of potassium.
A. The model predicts that cereals will have approximately 27 more milligrams of potassium for
every additional gram of fiber.
Administrators at Texas A&M University were interested in estimating the percentage of
students who are from aare from a bilingualbilingual family.family. nothing nothing The
A&M student body has about 42 comma 00042,000 members. How might the
administrators answer their question by applying the three Big Ideas?.
A.
The A&M administrators should take a survey. They should sample a part of the student
body, selecting respondents with a randomization method. They should be sure to draw a
sample of 20% of the student body.
B.
The A&M administrators should take a survey. They should sample a part of the student
body, selecting respondents with a randomization method. They should be sure to draw a
sufficiently large sample.
D.
The A&M administrators should take a survey. They should not use a random method of
selecting respondents. They should be sure to draw a sufficiently small sample.
