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- Posted on: Sun 22 Sep, 2013
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This is not step-by-step solution, it's the question/answers solution. MyStatLab has an option "View an Example" that has all the formulas. I have the works for all practice quizzes though.

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

a)(9,9) and (10,10); b)(0,11) and (11,0); c)(-9,5) and (10,9); d) (-7,-10) and (2,4).

2. Consider thr pairs of measurements shown to the right:

x | y |

4 | 4 |

5 | 4 |

7 | 1 |

3 | 5 |

2 | 5 |

5 | 2 |

6 | 2 |

3. A minitab printout relating the size of the diamond to the asking price for 308 diamonds shown below. The regression equation is PRICE= -2,294+11,591 CARAT.

4. Researchers investigated the effect of tablet surface area to volume on the rate at which a drug is released in a controlled-released dosage. For six similarly shaped tablets with different weights and thicknesses, the diffusional drug release rate was determined.

Drug_Release_Rate_(%_released/SQRT_time) | Sur._Area_to_Vol._(mm^2/mm^3) |

64 | 1.47 |

50 | 1.07 |

43 | 0.89 |

29 | 0.72 |

27 | 0.57 |

23 | 0.63 |

5. Explain what each of the following sample correlation coefficients tells you about the relationship between the x and y values:

a)r=1; b)r= -1; c)r=0; d)r=0.95: e)r=0.06; f)r= -0.96.

6. Construct a scattergram for each data set. Calculate r and r^2 for each data set:

x | y |

-1 | -1 |

0 | 2 |

1 | 3 |

2 | 6 |

3 | 8 |

b)

x | y |

-1 | 8 |

0 | 6 |

1 | 4 |

2 | 3 |

3 | 1 |

c).

x | y |

3 | 4 |

4 | 3 |

4 | 5 |

5 | 3 |

5 | 4 |

5 | 5 |

6 | 4 |

d).

x | y |

0 | 0 |

1 | 1 |

3 | 2 |

5 | 1 |

6 | 0 |

7. Suppose you fit the first-order model y=Bo+B1x1+B2x2+B3x3+B4x4+B5x5+Eto n=30 data points and obtain SSE=0.33 and R^2=0.94.

8. A study of traits of people was conducted. A rating score was determined for each in a sample of people of a large university. For one portion of the study, the researcher modeled a person's score (y) as a function of age, gender, education, and income. Data on n=199 people yielded the results in the table to the right.

9. A magazine reported on a study of the reliability of a commercial kit to test for arsenic in groundwater.

Well_ID | Latitude | Longitude | Depth | Arsenic |

1 | 23.7714 | 90.6221 | 45 | 311 |

2 | 23.7764 | 90.6492 | 45 | 327 |

3 | 23.7832 | 90.6321 | 100 | 163 |

4 | 23.7944 | 90.6386 | 60 | 250 |

5 | 23.7644 | 90.6224 | 90 | 15 |

6 | 23.7916 | 90.6228 | 125 | 20 |

7 | 23.7674 | 90.6225 | 30 | 194 |

8 | 23.7694 | 90.6176 | 75 | 324 |

9 | 23.7732 | 90.6147 | 60 | 627 |

10 | 23.7894 | 90.6482 | 150 | 248 |

11 | 23.7852 | 90.6215 | 90 | 24 |

12 | 23.7856 | 90.6207 | 30 | 160 |

13 | 23.7745 | 90.6496 | 75 | 163 |

14 | 23.7479 | 90.6387 | 45 | 256 |

15 | 23.7734 | 90.6487 | 100 | 243 |

16 | 23.7681 | 90.6463 | 100 | 329 |

17 | 23.7754 | 90.6452 | 75 | 626 |

18 | 23.7881 | 90.6489 | 150 | 16 |

19 | 23.7872 | 90.6218 | 45 | 169 |

20 | 23.7818 | 90.6243 | 125 | 249 |

Solution Description

Interpret the estimate