Caffeine in a sample of chocolate was measured five times, and the results were 1265 ppm caffeine with a standard deviation of 9 ppm. according to the product label, the chocolate contains 1250 ppm caffeine. are the experimental results statistically different from the label value at the 95% confidence level? a. yes, because tcalc < ttableb. yes, because tcalc > ttablec. no, because tcalc < ttabled. no, because tcalc > ttable