SOLUTION: An average computer mouse inspector can inspect 40 mice per hour with a population standard deviation of 10 mice per hour. The 42 computer mice inspectors at a particular factory c

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Question 1102488: An average computer mouse inspector can inspect 40 mice per hour with a population standard deviation of 10 mice per hour. The 42 computer mice inspectors at a particular factory can only inspect 33 mice per hour. Does the company have reason to believe that these inspectors are slower than average at alpha = 0.10?
A) No, because the test value -2.62 falls in the critical region.
B) Yes, because the test value -4.54 falls in the noncritical region.
C) No, becuase the test value -2.62 falls in the noncritical region.
D) Yes, because the test value -4.54 falls in the critical region.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
An average computer mouse inspector can inspect 40 mice per hour with a population standard deviation of 10 mice per hour. The 42 computer mice inspectors at a particular factory can only inspect 33 mice per hour. Does the company have reason to believe that these inspectors are slower than average at alpha = 0.10?
Ho: u = 40
Ha: u < 40
z(33) = (33-40)/(10/sqrt(42)) = -4.54
Answer:: D
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Note:: The answer has been changed. The test statistic does
fall in the critical region. You would reject Ho.
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Cheers,
Stan H.
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A) No, because the test value -2.62 falls in the critical region.
B) Yes, because the test value -4.54 falls in the noncritical region.
C) No, becuase the test value -2.62 falls in the noncritical region.
D) Yes, because the test value -4.54 falls in the critical region.