Starbucks has been tracking the calorie count of every beverage and food they sell.For over a year, they gathered data on every transaction at Starbucks coffee shops in several US cities.They determined a population mean of 247 calories and a population standard deviation of 201 calories per sale.

1,000 Starbucks locations in New York City (n=1,000) were asked to post the calories on their menus to see if posting the calorie count will impact the amount of calories in foods and beverages purchased.Across these locations in NYC, the reported sample mean was 232 calories per purchase.

What statistical test should be used to analyze these data? Is it a one- or two-tailed test?Explain your decision.