Question: Use the above histograms and statistics for Aylmer Avenue in 2002 and 2011 to infer changes in the (a) means and (b) modal classes of that avenue’s houses’ overall exterior qualities through time from 2002 to 2011. (c) Propose a research hypothesis and a null hypothesis about temporal change in overall exterior qualities of the same (paired-sample) houses. (d) Test these hypotheses, deciding whether and why the findings do or do not support the research hypothesis. Note the additional information that the standard deviation of the differences between pHQ2011s and pHQ2002s on Aylmer Avenue is equal to 34.7%. Note also the different number of surveyed houses in this 2002-2011 paired-samples test from that in the previous 1994-2002 test in question (7), due to imperfect matching of houses from one year to the next.

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