QNT561 QNT/561 Week 5 Practice Quiz (Version 1 and Version 2) - 25466

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1.      Give the slope and y-intercept for the line that passes through the pairs of points listed below:

a). (7,7) and (10,10).

 b). (0,13) and (13,0).

 

 c). (-3,1) and (5,4).

 

 d). (-12,-1) and (12, 4).

Second version:

 a).  (8,8) and (10,10).

b). (0,8) and (8,0).

 

 c). (-7,1) and (9,3).

 

 d). (-12,-9) and (6,5).

 

 

 

1.       Consider the pairs of measurements shown to the right:

x,y

4,6

6,7

8,10

7,9

3,6

2,5

 

1,3

 Second version:

Consider the pairs of measurements to the right.

 

x,y

8,2

7,4

6,4

3,7

5,4

2,9

1,9

1.       A minitab printout relating the size of the diamond (number of carats) to the asking price (dollars) for 308 diamonds is shown below: The regression equation is PRICE=-2305+11596 CARAT.

Version two:A minitab printout relating the size of the diamond (number of carats) to the asking price (dollars) for 308 diamonds is shown below:The regression equation is PRICE=-2297+11602 CARAT.

1.       Explain what each of the following sample correlation coefficients tell you about the relationship between the x and y values in the samples:

a)      r=1, b) r=-1; c). r=0; d) r=0.89; e) r=0.06; f) r=-0.96.

Second version:

 

a)      r=1; b) r=-1; c) r=0; d) r=0.9; e) r=0.12; f) r=-0.94.

Suppose  the first-order model y=Bo+B1x1+B2x2+B3x3+B4x4+B5x5+E to n=28 data points and obtain SSE=0.33 and R^2=0.95.

Second version:

Suppose  the first-order model y=Bo+B1x1+B2x2+B3x3+B4x4+B5x5+E to n=30 data points and obtain SSE=0.33 and R^2=0.93.

A magazine reported on a study of a reliability of a commercial kit to test for arsenic  in groundwater (20 groundwater wells).

 

Well_ID

Latitude

Longitude

Depth

Arsenic

1

23.7714

90.6221

30

311

2

23.7764

90.6492

60

327

3

23.7832

90.6321

125

163

4

23.7944

90.6386

30

250

5

23.7644

90.6224

100

15

6

23.7916

90.6228

100

20

7

23.7674

90.6225

45

194

8

23.7694

90.6176

90

324

9

23.7732

90.6147

75

627

10

23.7894

90.6482

125

248

11

23.7852

90.6215

75

24

12

23.7856

90.6207

45

160

13

23.7745

90.6496

90

163

14

23.7479

90.6387

60

256

15

23.7734

90.6487

90

243

16

23.7681

90.6463

90

329

17

23.7754

90.6452

90

626

18

23.7881

90.6489

125

16

19

23.7872

90.6218

30

169

20

23.7818

90.6243

125

249         

 

 

 

Version two: A magazine reported on a study of a reliability of a commercial kit to test for arsenic  in groundwater (20 groundwater wells).


 

Solution Description

What is the p-value?

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