Several counties in Minnesota and Wisconsin were randomly selected and information about the 2007 sweet corn crop was collected. The following yield rates in tons of sweet corn per acre harvested resulted.

a. Is there a difference in the variability of county yields as measured by the standard deviation of the yield rate? Use a = 0.05
b. Is the mean yield rate in Wisconsin significantly higher than the mean yield rate in Minnesota? Use a = 0.05.

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Yield, MN 7.38 6.27 6.26 6.02 7.38 6.32 6.74 5.13 6.54 5.71 Yield, WI 7.0 6.9 7.7 8.0 6.5 5.8 6.8 7.5