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

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## karapuz

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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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