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For several decades, it was a common practice in Southern California for houses to be built with pools in the backyard (as any airplane

 


For several decades, it was a common practice in Southern California for houses to be built with pools in the backyard (as any airplane flight which ends at a Southern California airport will reveal). Now, however, that practice may be changing, possibly because of the recent demand for landscaped homes, which experts believe help reduce pollution. A recent study examined a random sample of 155 houses built in Southern California between 1950 and 1985 and an independent, random sample of 72 houses built in Southern California from 1992 to the present. The sample of houses built in 1950-1985 contained 76 houses with pools, and the sample of houses built from 1992-present contained 22 houses with pools. Based on this survey, can we condlude, at the 0.01 level of significance, that the proportion p, of all Southern California houses built in 1950-1985 that were built with pools is greater than the proportion p, of all Southern California houses built from 1992-present that were built with pools? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) The null hypothesis: The alternative hypothesis: ,:0 The type of test statistic: (Choose one) The value of the test statistic: (Round to at least three decimal places.) The avalue: (Round to at least three decimal places.) www-awn.aleks.com/alekscgi/x/Isl.exe/1o_u-lgNslkr7j8P3jH-IBGBIH_OB3uhhqwxlXoS5SIQhuX6YjjUgDFQQdk39PAcnZ82-sHJalvzFtshLTg8iXQXdvV8r9o_eX-rBSBAytxlOCE1zo?1oBw7QYjlbavbSPXtx-YCjsh_7mMmrq#ite O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING Hypothesis test for the difference of population proportions Emmanuel V 5outher WItpoorsr Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) The null hypothesis: H 0. Aa IS. The alternative hypothesis: H, :0 D=D0 OSO The type of test statistic: |(Choose one) v O

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