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 = 0.05, that the hamburgers from the two chains have a different number of Calories? Chain A Chain B

Sample size 7 8

Sample mean 280 315

Sample Std Deviation 21 27 options:

No, because the test value -0.23 is inside the noncritical region - 2.365 < t< 2.365

Yes, because the test value -0.23 is inside the noncritical region - 2.447 < t < 2.447

Yes, because the test value -2.82 is outside the noncritical region - 2.447 < t < 2.447

No, because the test value -1.29 is inside the noncritical region - 2.365 < t < 2.365