Sample mean water use per day problem

Assignment Help Basic Statistics
Reference no: EM1385686

The American Water Works Association reports that the per capita water use in a single family home is 79 gallons per day. Legacy Ranch is a relatively new housing development consisting of 100 homes. The builders installed more efficient water fixtures, such as low flush toilets, and subsequently conducted a survey of the residences. Thirty homes responded, and the sample mean water use per day was 77 gallons with a standard deviation of 9.0 gallons per day.

At the .025 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 ≥ 79 and fail to reject H1 : μ < 79 when the test statistic is .

b) The value of the test statistic is . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

Reference no: EM1385686

Reviews

Write a Review

 
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd