in the past, patrons of a cinema complex have spent an averageof $2.50 for candy, with a standard deviation of $.90. The amountsof these exependitures have been normally distributed. Following anintensive publicity campaign by a local medical society, the meanexpenditure for a sample of 18 patrons is $2.10. In a one tail-testat the .05 level of significance, does this recent experiencesuggest a decline in spending.
Could someone help me set up the null and alternativehypothesis? I am not sure what they should be.