MATH 225N Week 8 Assignment; Understand the Difference Between Correlation and Causation

  • MATH 225N Week 8 Assignment; Understand the Difference Between Correlation and Causation
  • $10.00


Institution MATH 225N Statistical Reasoning for the Health Sciences
Contributor Gbenga
  1. Question:  A survey regarding truck engines found a positive correlation between the size of the engine and horsepower the engine produces. Answer the following question based only on this information.
  2. Question:  In studying the relationship between income and time spent exercising, suppose you computed r=−0.052 using n=19 data points. Using the critical values table below, determine if the value of r is significant or not.

df

CV (+ and -)

df

CV (+ and -)

df

CV (+ and -)

df

CV (+ and -)

1

0.997

11

0.555

21

0.413

40

0.304

2

0.950

12

0.532

22

0.404

50

0.273

3

0.878

13

0.514

23

0.396

60

0.250

4

0.811

14

0.497

24

0.388

70

0.232

5

0.754

15

0.482

25

0.381

80

0.217

6

0.707

16

0.468

26

0.374

90

0.205

7

0.666

17

0.456

27

0.367

100

0.195

8

0.632

18

0.444

28

0.361

 

 

9

0.602

19

0.433

29

0.355

 

 

10

0.576

20

0.423

30

0.349

 

 

  1. Question:  Suppose you computed r=0.493 using n=52 data points. Using the critical values table below, determine if the value of r is significant or not.

df

CV (+ and -)

df

CV (+ and -)

df

CV (+ and -)

df

CV (+ and -)

1

0.997

11

0.555

21

0.413

40

0.304

2

0.950

12

0.532

22

0.404

50

0.273

3

0.878

13

0.514

23

0.396

60

0.250

4

0.811

14

0.497

24

0.388

70

0.232

5

0.754

15

0.482

25

0.381

80

0.217

6

0.707

16

0.468

26

0.374

90

0.205

7

0.666

17

0.456

27

0.367

100

0.195

8

0.632

18

0.444

28

0.361

 

 

9

0.602

19

0.433

29

0.355

 

 

10

0.576

20

0.423

30

0.349

 

 

  1. Question: Which of the following data sets or plots could have a regression line with a negative slope?

 

 

Instituition / Term
Term Fall 2020
Institution MATH 225N Statistical Reasoning for the Health Sciences
Contributor Gbenga
 

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