1. A report in LTO stated that the average age of taxis in the Philippines is 9 years. An operation manager of a large taxi company selects a sample of 40 taxis and finds the average age of the taxis is 8.2 years. The o of the population is 2.3 years. At a = 0.05, can it be concluded that the average age of the taxis in his company is less than the national average? Solution: Step 1: State the hypotheses. Ho: H::

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1. A report in LTO stated that the average age of taxis in the Philippines is 9 years. An
operation manager of a large taxi company selects a sample of 40 taxis and finds the
average age of the taxis is 8.2 years. The o of the population is 2.3 years. At a = 0.05,
can it be concluded that the average age of the taxis in his company is less than the
national average?
Solution:
Step 1: State the hypotheses.
Ho:
H::
Step 2: The level of significance and critical region. a =
and zcritical =
Step 3: Compute for the value of one sample z test. Zcomputed
Step 4: Decision rule.
Step 5: Conclusion.
Transcribed Image Text:1. A report in LTO stated that the average age of taxis in the Philippines is 9 years. An operation manager of a large taxi company selects a sample of 40 taxis and finds the average age of the taxis is 8.2 years. The o of the population is 2.3 years. At a = 0.05, can it be concluded that the average age of the taxis in his company is less than the national average? Solution: Step 1: State the hypotheses. Ho: H:: Step 2: The level of significance and critical region. a = and zcritical = Step 3: Compute for the value of one sample z test. Zcomputed Step 4: Decision rule. Step 5: Conclusion.
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