60 Roses

An auditor estimated that the cost per diem in Nashville, Tennessee, has increased considerably between 1996 and 2006. To test this belief, 51 samples auditor business from company records for 1996, the average of the sample was $ 190 per day, with a population standard deviation of 18 $ 50. The auditor selects a second random sample of 47 business trips from the company's records for 2006, the average of the sample was $ 198 per day, with a population standard deviation of 15 , $ 60. Use an alpha level of .01 to test the assertion of the auditor that the average daily expenditure in Nashville has increased significantly?

the null hypothesis is that there has been no real change. I do not know what the alternative could be hypothesisi.

The Ho is ALWAYS mean = original average

mu = 190

The Ha is one of these:> original meaning, means "original, not mean equality of origin.

mu> 190 (increased by more resources)

The null hypothesis is there is no change
The other hypothesis would have been a change