Question: Observations on the abundance of Cameraria hamadryadella on oak trees was obtained by sampling each of 4 trees, in three vertical and 3 horizontal strata (9 observations per tree). The data file (mothnum.txt) or (mothnum.sav) contains the observations. Column 3 is (vertical stratum 1, horizontal stratum 1), column 4 is (vertical stratum 1, horizontal stratum 2), column 5 is (vertical stratum 1, horizontal stratum 3), column 6 is (vertical stratum 2, horizontal stratum 1), etc. Analyze these data, and interpret the tests you perform.