Dear Experts,

I am new in this.
This is an sample question:

Past, patrons of a cinema complex have spent an average of $2.50 for popcorn
and other snacks, with a standard deviation of $0.90. The amounts of these
expenditures have been normally distributed. FOllowing an intensive publicity
campaign by a local medical society, the mean expenditure for a sample of 18
patronisis found to be $2.10. In a one-tail test at the 0.05 level of
significance, does this recent experience suggest a dedline in spending?
determine and interpret the p-value for the test.

Please help to advise.

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