A report in LTO stated that the average age taxis in Philippines is 12 years. An operation manager of a large taxi company selects a sample of 40 taxis and finds the average age of the taxis is 11.2...

A report in LTO stated that the average age taxis in Philippines is 12 years. An operation manager of a large taxi company selects a sample of 40 taxis and finds the average age of the taxis is 11.2 years. The population standard deviation is 2.3 years. At a=0.05, can it be concluded that the average age of taxis in his company is less than the national average.?

Solution:

Step 1. State the null hypothesis

Ho:___________

Ha:____________

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.____________________________________

Sep 07, 2022

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A report in LTO stated that the average age taxis in Philippines is 12 years. An operation manager of a large taxi company selects a sample of 40 taxis and finds the average age of the taxis is 11.2...

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