2. The average credit card dept for a recent year was P43,100. Three years earlier the average credit card dept was P 41,890. Assume sample sizes of 50 were used and the standard deviations of both...

Extracted text: 2. The average credit card dept for a recent year was P43,100. Three years earlier the average credit card dept was P 41,890. Assume sample sizes of 50 were used and the standard deviations of both samples are P7,810. Is there enough evidence to believe that the average credit card dept has increased? Use.


Extracted text: Step 4: Decision rule. Step 5: Conclusion.