# QNT 561 Week 5 Quiz

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**QNT 561 Week 5 Quiz**

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).

2. Consider the pairs of measurements shown to the right: X: 4 6 8 7 3 2 1 Y: 6 7 10 9 6 5 3 Second version: Consider the pairs of measurements to the right. X: 8 7 6 3 5 2 1 Y: 2 4 4 7 4 9 9

3. 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.

4. 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:

5). 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.

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

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