A reporter bought hamburgers at randomly selected stores of two different restaurant chains ...

A reporter bought hamburgers at randomly selected stores of two different restaurant chains and had the number of calories in each hamburger measured, can the reporter conclude at a=0.05 that the hamburgers from the two chains have a different number of calories? sample size=chain a 7 and chain b 8 sample mean=chain a 280 cal and chain b 315 cal sample standard deviation=chain a 21 cal and chain b 27cal