STAT501 (Sec

STAT501 (Sec. 3) FINAL EXAM STORIES Fall 2003

  1. The data are pollution indexes for air samples from two areas, A and B, of a city.

A

2.92

1.88

5.35

3.81

4.69

4.86

5.81

5.55

B

1.84

0.95

4.26

3.18

3.44

3.69

4.95

4.47

(Eight columns of numbers: 1st row for area A, 2nd row area B.)

2. Four insecticides (A,B,C,D) were compared by subjecting six groups of 100 insects to insecticide A, another 6 groups to insecticide B, etc. (The experimental units are the groups.) The response for each group was the number killed within 15 seconds.

3. (Continuation of problem 2)

DATA FOR PROBLEMS 2 AND 3

Insctcid A B C D A B C D A B C D A B C D A B C D A B C D

Nkilled 85 90 93 98 82 92 94 98 83 90 96 100 88 91 95 97 89 93 96 97 92 81 94 99

(Twenty-four letters, A,B,C,D etc., followed by 24 corresponding values of the response variable nkilled.)

4. Fourteen identical solutions of blue-green algae (Spirulina platensis) were prepared. The growth of solution #1 was measured using a light absorption technique at the end of day 1, solution #2 was measured at the end of day 2, etc.

DATA FOR PROBLEM 4

x = time in days, y = logarithm of light absorption, interpreted as "growth"

x 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14

y -0.12, 0.49, 0.88, 1.40, 2.09, 2.03, 2.45, 2.44, 2.88, 2.57, 3.10, 3.58, 3.61, 3.24

(Fourteen x-values, separated by commas, followed by fourteen corresponding y-values, separated by commas.)