Chicago O'Hare and Atlanta Hartsfield-Jackson are the two busiest airports in the United States. The congestion often leads to delayed flight arrivals as well as delayed flight departures. The Bureau of Transportation tracks the on-time and delayed performance at major airports (Travel & Leisure, November 2006). A flight is considered delayed if it is more than 15 minutes behind schedule. The following sample data show the delayed departures at Chicago O'Hare and Atlanta Hartsfield-Jackson airports. A. State the hypotheses that can be used to determine whether the population proportions of delayed departures differ at these two airports.

The following discussion relates to the opportunity costs.

For this discussion you must:

1. Write a post (100-150 words) that gives your answer to this question: With recent tornadoes in Oklahoma many argue that all public schools in Oklahoma must have tornado shelters. Some oppose this proposition. Explain from an economist point of view why that may be the case (think about the costs and the benefits of building the shelters) Please be very specific in your answer.