the twentieth century, it was a common practice in Southern lifornia for houses to be built with pools in the backyard. For n mes, however, that practice may be changing, possibly as a m help reduce climate change. A recent study examined a rando mple of 147 houses built in Southern California in the twentieth d an independent, random sample of 85 new houses built in So alifornia. The sample of twentieth century houses contained 58 th pools, and the sample of new houses contained 22 houses wi ols. ased on this survey, can we conclude, at the 0.1 level of signific at the proportion p, of all Southern California twentieth century at were built with pools is greater than the proportion p, of all buthern California houses that were built with pools? rform a one-tailed test. Then complete the parts below. rry your intermediate computations to three or more decimal d round your answers as specified in the parts below. (If neces nsult a list of formulas.) (a) State the null hypothesis H, and the alternative hypothesis H. O Ho : 0 X S H :0