Question: Florida County Data Set. Examine the Florida County data set, described in Appendix C.4. Divide the counties into four groups according to the quartile of

Florida County Data Set. Examine the Florida County data set, described in Appendix C.4. Divide the counties into four groups according to the quartile of their percentage of adults lacking a high school degree. (This quartile information is already part of the data set.)

Do the groups differ significantlywith respect to their median income? In particular, is there a significant linear trend inmedian income? This data is observational.

What limitations does that place on your interpretation? This data is also aggregated.

Using a Web search, what is aggregation bias and how might that further limit your interpretation?

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