A plumbing company has found that the standard deviation for the average length of time, in minutes, for installing a bathtub is 30 minutes. The plumbing company advertises that a bathtub installation takes no more than 2 hours. The owner of the company hired a statistician to test the company's claim. The statistician randomly selected a sample of 40 bath- tub installations. The sample yielded i = 150 minutes ands = 35 minutes. State the decision rule at the 10% significance level. It cannot be determined from the information given. Reject Ho if T.S. > 1.645. Reject Ho if T.S. > 1.303. O Reject Ho if T.S. > 1.282

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Author:Amos Gilat
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A plumbing company has
found that the standard
deviation for the average
length of time, in minutes, for
installing a bathtub is 30
minutes. The plumbing
company advertises that a
bathtub installation takes no
more than 2 hours. The owner
of the company hired a
statistician to test the
company's claim. The
statistician randomly selected
a sample of 40 bath- tub
installations. The sample
yielded i = 150 minutes and s
= 35 minutes. State the
decision rule at the 10%
significance level.
It cannot be determined
from the information
given.
Reject Ho if T.S. > 1.645.
Reject Ho if T.S. > 1.303.
O Reject Ho if T.S. > 1.282
II
Transcribed Image Text:A plumbing company has found that the standard deviation for the average length of time, in minutes, for installing a bathtub is 30 minutes. The plumbing company advertises that a bathtub installation takes no more than 2 hours. The owner of the company hired a statistician to test the company's claim. The statistician randomly selected a sample of 40 bath- tub installations. The sample yielded i = 150 minutes and s = 35 minutes. State the decision rule at the 10% significance level. It cannot be determined from the information given. Reject Ho if T.S. > 1.645. Reject Ho if T.S. > 1.303. O Reject Ho if T.S. > 1.282 II
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