A3. For each of the following situations give either the response "could happen" (CH) or the response "impossible" (I). For example, "x=-19.4" gets the response CH while "x-1=x+1" would get the response I. In dealing with these situations, you should assume that the arithmetic is always done correctly. (a) (b) (c) In comparing before-and-after data on the performances of 37 mutual funds, the standard deviations were Sbefore = 42.4 and Safter = 47.2. The standard deviation of the "after minus before" difference was 12.4. Martha had a sample of data n in inches and tested the null hypothesis H= 10 inches against the alternative hypothesis H : 0 10 inches. Edna converted the data to centimeters by multiplying by 2.54 cm and tested H = 25.4 cm against H: 25.4 cm. Martha in 0 : accepted the null hypothesis while Edna (using the same ) rejected it. In a single sample x = 15.2 and s = 33.5.