Explanation:
3/ Purpose you are concerned with the Average
Value of invoices based on the Sample of 12
Invoices. The Sample mean is found to be
Birr 110. Past experience Shows that the
Population mean is Birr 120 and the Sample
Standard deviation is 50. using the 0.05 level
of significance, is there evidence that the
average value hase Changed from Birr 120?
Follow the five-Step hypotheses testing
procedure to Show that whether there is a
Significance Change or not.