the American Water Works Association reports that the per capita water use in a
ID: 3226674 • Letter: T
Question
the American Water Works Association reports that the per capita water use in a single-family home is 63 gallons per day. Legacy Ranch is a relatively new housing development. The builders installed more efficient water fixtures, such as low-flush toilets, and subsequently conducted a survey of the residences. Twenty-eight owners responded, and the sample mean water use per day was 60 gallons with a standard deviation of 8.9 gallons per day. At the 0.01 level of significance, is that enough evidence to conclude that residents of Legacy Ranch use less water on average? a. What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) Reject H0: µ 63 when the test statistic is more than incorrect 2.462 incorrect. b. The value of the test statistic is -1.783 correct. (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) c. What is your decision regarding H0? Fail to reject correct
Explanation / Answer
deicision rule : reject Ho: when test statisitc<=-2.473
please check and reply for above . I think rest of them are correct for you
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