If you are a California resident, the API (Academic Performance Index) may be published by your local paper. The 2009-2010 accountability progress report for Riverside County, California, was published in the Press-Enterprise listing the API and Growth (difference in 2010 and 2009 API) for all school districts in the county, together with whether each school has met the federal Adequate Yearly Progress guidelines. The first two of these measures are given for a sample of elementary schools from the two school districts in Riverside, California.

1. To study these data statistically, begin by finding the means and standard deviations for the API and the Growth scores for each of the two districts.
2. Test for a significant growth in API scores for both the Alvord and Riverside Unified school districts. Use α = .05.
3. Test for a significant difference in API for Alvord and Riverside Unified school districts using α = .05.

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Alvord Schools API Growth API Riverside Unified Schools Lake Matthews Alcott Growth Stokoe Orrenmaa Collett La Granada Terrace McAuliffe Valley View 891 778 18 745 731 815 40 789 23 28 Harrison Highgrove 762 798 796 731 818 769 815 841 876 35 34 Jefferson Longfellow Magnolia Mountain View Victoria Woodcrest Franklin 28