Air pollution in large U.S. cities is monitored to see if it conforms to requirements set by the Environmental Protection Agency. The following data, expressed as an air pollution index, give the air quality of a city for 10 randomly selected days.

(a) Draw a probability plot and test for normality.
(b) Construct a 95% confidence interval for the actual median air pollution index for this city and interpret its meaning.

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57.3 58. 58.7 66.7 58.6 61.9 59.0 64.4 62.6 64.9