A company that makes hotel toilets claims that its new pressure-assisted toilet reduces the average amount of water used by more than 0.5 gallon per flush when compared to its current model. To test this claim, the company randomly selects 30 toilets of each type and measures the amount of water that is used when each toilet is flushed once. For the current-model toilets, the mean amount of water used is 1.64 gal with a standard deviation o 0.29 gal. For the new toilets, the mean amount of water used is 1.09 gal with a standard deviation of 0.18 gal. Researchers want to perform a test of Ho: Mnew - Mcurr = 0.5 versus Ha: Mnew - Mcurr > 0.5.

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A company that makes hotel toilets claims that its new pressure-assisted toilet reduces the average amount of water used by
more than 0.5 gallon per flush when compared to its current model.
To test this claim, the company randomly selects 30 toilets of each type and measures the amount of water that is used when
each toilet is flushed once. For the current-model toilets, the mean amount of water used is 1.64 gal with a standard deviation of
0.29 gal. For the new toilets, the mean amount of water used is 1.09 gal with a standard deviation of 0.18 gal.
Researchers want to perform a test of Ho: Mnew - Mcurr = 0.5 versus Ha: Mnew
What is the value of the standardized test statistic?
What is the P-value of this test using df = 29?
t=
Mcurr > 0.5.
(Round to 1 decimal place)
(Round to 4 decimal places)
Transcribed Image Text:A company that makes hotel toilets claims that its new pressure-assisted toilet reduces the average amount of water used by more than 0.5 gallon per flush when compared to its current model. To test this claim, the company randomly selects 30 toilets of each type and measures the amount of water that is used when each toilet is flushed once. For the current-model toilets, the mean amount of water used is 1.64 gal with a standard deviation of 0.29 gal. For the new toilets, the mean amount of water used is 1.09 gal with a standard deviation of 0.18 gal. Researchers want to perform a test of Ho: Mnew - Mcurr = 0.5 versus Ha: Mnew What is the value of the standardized test statistic? What is the P-value of this test using df = 29? t= Mcurr > 0.5. (Round to 1 decimal place) (Round to 4 decimal places)
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