Exam 3: Descriptive Study of Bivariate Data

For one coastal state, there is a high correlation between ice cream sales and number of people swimming in the ocean. Suggest a possible lurking variable and explain what is meant by the term lurking variable.

(Essay)

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Question 21

A value of r really close to -1 means that the linear association ______.

(Multiple Choice)

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Question 22

Consider the data set Calculate the (a) sample means (b) S_xx , S_xy , S_yy (c) sample correlation coefficient.

(Essay)

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Question 23

Consider the data set Calculate the (a) sample means (b)S_xx , S_xy , S_yy (c) sample correlation coefficient.

(Essay)

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Question 24

If all (x, y) values lie exactly on a straight line with a ______ slope, then r = +1.

(Short Answer)

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Question 25

A scientist in a center for disease control observes that the number of bacteria in a culture and air pollution in the city rise with time. Is there exists a lurking variable in this case?

(Short Answer)

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Question 26

Consider the data set Find the sample correlation coefficient using the formula .

(Short Answer)

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Question 27

Consider the data set A) Complete the table. Use the formula to calculate the sample correlation. Round your answer to three decimal places.

(Essay)

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Question 28

Calculations from a data set of n = 36 pairs of (x, y) values have provided the following results. Obtain the correlation coefficient.

(Short Answer)

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Question 29

For the data set, compute the least squares estimates. A) B)

(Short Answer)

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Question 30

A line is determined by two constants. One of these constants is the ______, that is, the amount that y increases whenever x is increased by one unit.

(Short Answer)

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Question 31

The sign of the correlation coefficient r, indicates the weakness of a linear relation.

(True/False)

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Question 32

Consider the line A) What is its intercept? B) What is its slope?

(Short Answer)

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Question 33

A line is determined by two constants. One of these constants is the ______, that is, its height above the origin.

(Short Answer)

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Question 34

In a group of 180 college students, 43 are science majors, 66 are freshmen, and 31 are both. Based on these data, complete the following two-way frequency table.

(Essay)

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Question 35

Suppose from a data set of distance measurements in yards and time measurements in hours, the value of r is found to be 0.82. What would the value of r be if the distances were measured in feet and time in minutes.

(Multiple Choice)

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Question 36

Estimate the correlation coefficient of the figure below.

(Multiple Choice)

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Question 37

Is the correlation in the figure about (a) .2, (b) -.4, (c) .4, (d) .8, or (e) -.9?

(Short Answer)

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Question 38

If the pattern of (x, y) values is a band that runs from left to right, then r > 0.

(Short Answer)

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Question 39

Find the scatter diagram that corresponds to the correlation coefficient r = -.8.

(Multiple Choice)

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Question 40

Showing 21 - 40 of 44

For one coastal state, there is a high correlation between ice cream sales and number of people swimming in the ocean. Suggest a possible lurking variable and explain what is meant by the term lurking variable.

A value of r really close to -1 means that the linear association ______.

Consider the data set Calculate the (a) sample means (b) S_xx , S_xy , S_yy (c) sample correlation coefficient.

Consider the data set Calculate the (a) sample means (b)S_xx , S_xy , S_yy (c) sample correlation coefficient.

If all (x, y) values lie exactly on a straight line with a ______ slope, then r = +1.

A scientist in a center for disease control observes that the number of bacteria in a culture and air pollution in the city rise with time. Is there exists a lurking variable in this case?

Consider the data set Find the sample correlation coefficient using the formula .

Consider the data set A) Complete the table. Use the formula to calculate the sample correlation. Round your answer to three decimal places.

Calculations from a data set of n = 36 pairs of (x, y) values have provided the following results. Obtain the correlation coefficient.

For the data set, compute the least squares estimates. A) B)

A line is determined by two constants. One of these constants is the ______, that is, the amount that y increases whenever x is increased by one unit.

The sign of the correlation coefficient r, indicates the weakness of a linear relation.

Consider the line A) What is its intercept? B) What is its slope?

A line is determined by two constants. One of these constants is the ______, that is, its height above the origin.

In a group of 180 college students, 43 are science majors, 66 are freshmen, and 31 are both. Based on these data, complete the following two-way frequency table.

Suppose from a data set of distance measurements in yards and time measurements in hours, the value of r is found to be 0.82. What would the value of r be if the distances were measured in feet and time in minutes.

Estimate the correlation coefficient of the figure below.

Is the correlation in the figure about (a) .2, (b) -.4, (c) .4, (d) .8, or (e) -.9?

If the pattern of (x, y) values is a band that runs from left to right, then r > 0.

Find the scatter diagram that corresponds to the correlation coefficient r = -.8.

Introduction to Statistics

Organization and Description of Data

Probability

Probability Distributions

The Normal Distribution

Variation in Repeated Samplessampling Distributions

Drawing Inferences From Large Samples

Small Sample Inferences for Normal Populations

Comparing Two Treatments

Regression Analysis I

Regression Analysis II Multiple Linear Regression and Other Topics

Analysis of Categorical Data

Analysis of Variance Anova

Nonparametric Inference

Filters

Exam 3: Descriptive Study of Bivariate Data

For one coastal state, there is a high correlation between ice cream sales and number of people swimming in the ocean. Suggest a possible lurking variable and explain what is meant by the term lurking variable.

A value of r really close to -1 means that the linear association ______.

Consider the data set Calculate the (a) sample means (b) Sxx , Sxy , Syy (c) sample correlation coefficient.

Consider the data set Calculate the (a) sample means (b)Sxx , Sxy , Syy (c) sample correlation coefficient.

If all (x, y) values lie exactly on a straight line with a ______ slope, then r = +1.

A scientist in a center for disease control observes that the number of bacteria in a culture and air pollution in the city rise with time. Is there exists a lurking variable in this case?

Consider the data set Find the sample correlation coefficient using the formula .

Consider the data set A) Complete the table. Use the formula to calculate the sample correlation. Round your answer to three decimal places.

Calculations from a data set of n = 36 pairs of (x, y) values have provided the following results. Obtain the correlation coefficient.

For the data set, compute the least squares estimates. A) B)

A line is determined by two constants. One of these constants is the ______, that is, the amount that y increases whenever x is increased by one unit.

The sign of the correlation coefficient r, indicates the weakness of a linear relation.

Consider the line A) What is its intercept? B) What is its slope?

A line is determined by two constants. One of these constants is the ______, that is, its height above the origin.

In a group of 180 college students, 43 are science majors, 66 are freshmen, and 31 are both. Based on these data, complete the following two-way frequency table.

Suppose from a data set of distance measurements in yards and time measurements in hours, the value of r is found to be 0.82. What would the value of r be if the distances were measured in feet and time in minutes.

Estimate the correlation coefficient of the figure below.

Is the correlation in the figure about (a) .2, (b) -.4, (c) .4, (d) .8, or (e) -.9?

If the pattern of (x, y) values is a band that runs from ______ left to ______ right, then r > 0.

Find the scatter diagram that corresponds to the correlation coefficient r = -.8.

Introduction to Statistics

Organization and Description of Data

Probability

Probability Distributions

The Normal Distribution

Variation in Repeated Samplessampling Distributions

Drawing Inferences From Large Samples

Small Sample Inferences for Normal Populations

Comparing Two Treatments

Regression Analysis I

Regression Analysis II Multiple Linear Regression and Other Topics

Analysis of Categorical Data

Analysis of Variance Anova

Nonparametric Inference

Filters

Consider the data set Calculate the (a) sample means (b) S_xx , S_xy , S_yy (c) sample correlation coefficient.

Consider the data set Calculate the (a) sample means (b)S_xx , S_xy , S_yy (c) sample correlation coefficient.

If the pattern of (x, y) values is a band that runs from left to right, then r > 0.