Question 1

Several scatterplots are given with calculated correlations. Which is which?
- 
a)-0.798,b)0.009,c)0.084,d)0.948

Accepted Answer

A) 1a,2b,3c,4d 
B) 1b,2c,3d,4a 
C) 1b,2c,3a,4d 
D) 1d,2a,3b,4c 
E) 1c,2a,3d,4c 
A) 1a,2b,3c,4d 
B) 1b,2c,3d,4a 
C) 1b,2c,3a,4d 
D) 1d,2a,3b,4c 
E) 1c,2a,3d,4c

Question 2

Owners of a new appliances store tracked sales (in thousands)for the first 10 days,and displayed the data in a scatterplot.Make a histogram of the daily sales since the shop has been in business.

Accepted Answer

The answer of Owners of a new appliances store tracked...

Question 3

Cloudy days,rainy days

Accepted Answer

A) Negative,nonlinear,strong 
B) Positive,nonlinear,moderate 
C) Negative,linear,strong 
D) Positive,nonlinear,strong 
E) Positive,linear,moderate 
A) Negative,nonlinear,strong 
B) Positive,nonlinear,moderate 
C) Negative,linear,strong 
D) Positive,nonlinear,strong 
E) Positive,linear,moderate

Question 4

A science instructor assigns a group of students to investigate the relationship between the pH of the water of a river and its water's hardness (measured in grains).Some students wrote these conclusions: "there was a very strong correlation of 0.902 grains between pH of the water and water's hardness." Is the calculation of the correlation appropriate?

Accepted Answer

A) No: there is little or no association. 
B) Yes: the pH and the hardness of the water are data collected from the same river. 
C) No: pH and hardness of water have different units. 
D) Yes: correlation is less than 1. 
E) No: correlation has no units. 
A) No: there is little or no association. 
B) Yes: the pH and the hardness of the water are data collected from the same river. 
C) No: pH and hardness of water have different units. 
D) Yes: correlation is less than 1. 
E) No: correlation has no units.

Question 5

A scientist collects data to predict the wheat yield (in bushels per acre)based on rainfall (in millimetres).The results are recorded in the table below.

Accepted Answer

A) 0.932 
B) 0.943 
C) 0.952 
D) 0.942 
E) 0.941 
A) 0.932 
B) 0.943 
C) 0.952 
D) 0.942 
E) 0.941

Question 6

Year,results of race

Accepted Answer

A) Year: both
Results of race: both 
B) Year: both
Results of race: explanatory 
C) Year: explanatory
Results of race: both 
D) Year: explanatory
Results of race: response 
E) Year: response
Results of race: explanatory 
A) Year: both
Results of race: both 
B) Year: both
Results of race: explanatory 
C) Year: explanatory
Results of race: both 
D) Year: explanatory
Results of race: response 
E) Year: response
Results of race: explanatory

Question 7

Oranges: weight (ounces),oranges: weight (grams)

Accepted Answer

A) Positive,straight,strong 
B) Positive,nonlinear,moderate 
C) Negative,straight,moderate 
D) Negative,nonlinear,moderate 
E) Positive,no form,strong 
A) Positive,straight,strong 
B) Positive,nonlinear,moderate 
C) Negative,straight,moderate 
D) Negative,nonlinear,moderate 
E) Positive,no form,strong

Question 8

The following table gives the total sales (revenue)and profits for 8 retailers.

Accepted Answer

The answer of The following table gives the total sales...

Question 9

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible).
-

Accepted Answer

A) Moderately strong association 
B) Positive association,linear association 
C) Positive association,moderately strong association 
D) Negative association,linear association 
E) Little or no association 
A) Moderately strong association 
B) Positive association,linear association 
C) Positive association,moderately strong association 
D) Negative association,linear association 
E) Little or no association

Question 10

Almost all of the acidity of soda pop comes from the phosphoric acid which is added to give them a sharper flavor.Is there a relation between the pH of the soda and the amount of phosphoric acid (in grams)? The pH and phosphoric acid content of 12 ounces of several brands of soda are shown on the following scatterplot.The correlation between pH and phosphoric acid is -0.956.Describe the association.

Accepted Answer

A) Strong relation in a negative direction 
B) Weak linear relation in a negative direction 
C) Strong linear relation in a positive direction 
D) Very strong linear relation in a negative direction 
E) No evidence of relation 
A) Strong relation in a negative direction 
B) Weak linear relation in a negative direction 
C) Strong linear relation in a positive direction 
D) Very strong linear relation in a negative direction 
E) No evidence of relation

Question 11

Oranges: circumference (centimetres),oranges: weight (grams)

Accepted Answer

A) Oranges: circumference (centimetres): both
Oranges: weight (grams): both 
B) Oranges: circumference (centimetres): explanatory
Oranges: weight (grams): both 
C) Oranges: circumference (centimetres): explanatory
Oranges: weight (grams): response 
D) Oranges: circumference (centimetres): both
Oranges: weight (grams): explanatory 
E) Oranges: circumference (centimetres): response
Oranges: weight (grams): explanatory 
A) Oranges: circumference (centimetres): both
Oranges: weight (grams): both 
B) Oranges: circumference (centimetres): explanatory
Oranges: weight (grams): both 
C) Oranges: circumference (centimetres): explanatory
Oranges: weight (grams): response 
D) Oranges: circumference (centimetres): both
Oranges: weight (grams): explanatory 
E) Oranges: circumference (centimetres): response
Oranges: weight (grams): explanatory

Question 12

Fast food is often considered unhealthy because much of it is high in both fat and calories.But are the two related? Here are the fat (in grams)and calories contents of several brands of burgers.If the fat was recorded in kilograms,how would this change the correlation? Suppose the relation is linear.

Accepted Answer

A) Yes: the two variables do not have the same units. 
B) No: the relation is linear. 
C) Yes: correlation changes with change of units. 
D) No: correlation changes with change of units. 
E) No: correlation does not change with change of units. 
A) Yes: the two variables do not have the same units. 
B) No: the relation is linear. 
C) Yes: correlation changes with change of units. 
D) No: correlation changes with change of units. 
E) No: correlation does not change with change of units.

Question 13

A science instructor assigns a group of students to investigate the relationship between the pH of the water of a river and its water's hardness (measured in grains).Some students wrote these conclusions: "there was a very strong correlation of 1.35 between pH of the water and water's hardness." Is the calculation of the correlation appropriate?

Accepted Answer

A) Yes: correlation can be greater than 1. 
B) Yes: the pH and the hardness of the water are data collected from the same river. 
C) No: there is little or no association. 
D) No: correlation cannot be greater than 1. 
E) No: correlation must be equal to 1. 
A) Yes: correlation can be greater than 1. 
B) Yes: the pH and the hardness of the water are data collected from the same river. 
C) No: there is little or no association. 
D) No: correlation cannot be greater than 1. 
E) No: correlation must be equal to 1.

Question 14

Owners of a small shop tracked the number of customers and the sales each hour for a 7 hour period.The results are recorded in the table below.

Accepted Answer

A) 0.744 
B) 0.725 
C) -0.763 
D) 0.763 
E) 0.801 
A) 0.744 
B) 0.725 
C) -0.763 
D) 0.763 
E) 0.801

Question 15

A group of persons filled in a questionnaire their age and the number of countries they had visited in their lifetime.The results are recorded in the table below.

Accepted Answer

A) 0.6 
B) -1 
C) -0.6 
D) 0.8 
E) 12 
A) 0.6 
B) -1 
C) -0.6 
D) 0.8 
E) 12

Question 16

The table contains the daily study time for students from Statistics 101 and the grades on their quiz.

Accepted Answer

The answer of The table contains the daily study time...

Question 17

Air pressure,altitude

Accepted Answer

A) Air pressure: both
Altitude: both 
B) Air pressure: response
Altitude: explanatory 
C) Air pressure: explanatory
Altitude: response 
D) Air pressure: explanatory
Altitude: both 
E) Air pressure: both
Altitude: explanatory 
A) Air pressure: both
Altitude: both 
B) Air pressure: response
Altitude: explanatory 
C) Air pressure: explanatory
Altitude: response 
D) Air pressure: explanatory
Altitude: both 
E) Air pressure: both
Altitude: explanatory

Question 18

Several scatterplots are given with calculated correlations. Which is which?
- 
a)-0.847,b)-0.633,c)-0.433,d)-0.973

Accepted Answer

A) 1b,2d,3a,4c 
B) 1b,2a,3d,4c 
C) 1a,2c,3b,4d 
D) 1b,2d,3c,4d 
E) 1c,2d,3b,4a 
A) 1b,2d,3a,4c 
B) 1b,2a,3d,4c 
C) 1a,2c,3b,4d 
D) 1b,2d,3c,4d 
E) 1c,2d,3b,4a

Question 19

A survey was conducted in 26 counties to determine the percentage of teenagers who had used marijuana and other drugs.Data are displayed in the following scatterplot.Make a histogram of the other drugs.

Accepted Answer

The answer of A survey was conducted in 26 counties...

Question 20

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible).
-

Accepted Answer

A) Little or no association 
B) Positive association,moderately strong association 
C) Negative association,linear association 
D) Moderately strong non-linear association 
E) Negative association,moderately strong association 
A) Little or no association 
B) Positive association,moderately strong association 
C) Negative association,linear association 
D) Moderately strong non-linear association 
E) Negative association,moderately strong association

Exam 6: Scatterplots, association, and Correlation

Several scatterplots are given with calculated correlations. Which is which? - a)-0.798,b)0.009,c)0.084,d)0.948

Owners of a new appliances store tracked sales (in thousands)for the first 10 days,and displayed the data in a scatterplot.Make a histogram of the daily sales since the shop has been in business.

Cloudy days,rainy days

A scientist collects data to predict the wheat yield (in bushels per acre)based on rainfall (in millimetres).The results are recorded in the table below.

Year,results of race

Oranges: weight (ounces),oranges: weight (grams)

The following table gives the total sales (revenue)and profits for 8 retailers.

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible). -

Oranges: circumference (centimetres),oranges: weight (grams)

Owners of a small shop tracked the number of customers and the sales each hour for a 7 hour period.The results are recorded in the table below.

A group of persons filled in a questionnaire their age and the number of countries they had visited in their lifetime.The results are recorded in the table below.

The table contains the daily study time for students from Statistics 101 and the grades on their quiz.

Air pressure,altitude

Several scatterplots are given with calculated correlations. Which is which? - a)-0.847,b)-0.633,c)-0.433,d)-0.973

A survey was conducted in 26 counties to determine the percentage of teenagers who had used marijuana and other drugs.Data are displayed in the following scatterplot.Make a histogram of the other drugs.

Determine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible). -

Data

Displaying and Describing Categorical Data

Displaying and Summarizing Quantitative Data

Understanding and Comparing Distributions

The Standard Deviation As a Ruler and the Normal Model

Linear Regression

Regression Wisdom

Re-Expressing Data: Get It Straight

Understanding Randomness

Sample Surveys

Experiments and Observational Surveys

From Randomness to Probability

Probability Rules

Random Variables

Probability Models

Sampling Distribution Models

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

More About Tests

Comparing Two Proportions

Inferences About Means

Comparing Means

Paired Samples and Blocks

Comparing Counts

Inferences for Regression

Analysis of Variance

Multifactor Analysis of Variance

Multiple Regression

Multiple Regression Wisdom

Rank-Based Nonparametric Tests

The Bootstrap

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