Question: Use the above histograms and statistics for Aylmer Avenue in 1994 and 2002 to infer changes in the (a) means and (b) modal classes of that avenue’s houses’ overall exterior qualities through time from 1994 to 2002. (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 pHQ2002s and pHQ1994s on Aylmer Avenue is equal to 33.2%. Note also the different number of surveyed houses in this 1994-2002 paired-samples test from that in the subsequent 2002-2011 test in question (8), due to imperfect matching of houses from one year to the next.

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