Ammonia in car exhaust. Refer to the Environmental Science & Technology (Sept. 1, 2000) study of ammonia levels near the exit ramp of a San Francisco highway tunnel, presented in Exercise 2.59 (p. 59). The daily ammonia concentrations (parts per million) on eight randomly selected days during afternoon drive time are reproduced in the accompanying table. Suppose you want to determine whether the median daily ammonia concentration for all afternoon drive-time days exceeds 1.5 ppm.
AMMONIA
1.53 | 1.50 | 1.37 | 1.51 | 1.55 | 1.42 | 1.41 | 1.48 |
a. Set up the null and alternative hypotheses for the test.
b. Find the value of the test statistic.
c. Find the p-value of the test.
d. Give the appropriate conclusion (in the words of the problem) if α = .05.
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