Carry all calculations and the answer to 4 decimal places unless otherwise noted. For example, the number "123.0000" has been carried and reported to 4 decimal places. (Yes, trailing zeros count.)
Complaints about weekday airline flights not being on time average about 15.17 complaints per month at airports in small U. S. cities. The local airport is proud to advertise that its average monthly on-time performance is superior to the national monthly average for small city airports. Since June 2003, a random sample of nine months reveals that the number of complaints regarding weekday flights not being on time at the local airport were:
9 10 12 13 14 15 15 16 17
Note: "mu" refers to the population mean.
The null hypothesis should read:
The alternate hypothesis should read:
What is the correct test statistic?
Why? What is the sample mean? (Fill in the blank with the correct number to 4 decimal places.)
What is the population mean, mu? (Fill in the blank with the correct number to 4 decimal places.)
Will you use the population standard deviation or the sample standard deviation?
What number will you use for the standard deviation? (Fill in the blank with the correct number to 4 decimal places.)
What is the computed value of the test statistic? (Fill in the blank with the correct number to 4 decimal places.)