124 Ammonia in car exhaust. Environmental Science &

Technology (September 1, 2000) did a study on the ammonia levels near the exit ramp of a San Francisco highway tunnel. The ammonia concentration (parts per million)

data for eight randomly selected days during the afternoon drive time are reproduced in the accompanying table and saved in the AMMONIA file. Find a 99% confidence interval for the population mean daily ammonia level in air in the tunnel. Interpret your result.

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1.53 1.50 1.37 1.51 1.55 1.42 1.41 1.48