The sample data table On-Time Arrivals.jmp (Aviation Consumer Home Page, 1999) contains the percentage of airlines’ planes that arrived on time in 29 airports (those that the Department of Transportation designates “reportable”). You are interested in seeing if there are differences between certain months. (a) Suppose you want to examine the differences between March and June. Is this a situation where a grouped test of two means is appropriate or would a matched pairs test be a better choice? (b) Based on your answer in (a), determine if there is a difference in on-time arrivals between the two months. (c) Similarly, determine if there is a significant difference between the months June and August, and also between March and August.
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