Which conclusion is the most reasonable? The sample gives strong evidence that the mean birth weight for the population of all babies is 3,400 grams. There has been a decrease in birth weight from the 2005 O A sample with a mean birth weight of 3,400 grams is not surprising if the population's mean birth weight is 3.500 grams; therefore, the sample does not provide convincing evidence that the town's mean birth weight is less than 3.500 grams this year. The actual sample is 100 grams less than the town's mean birth weight last year; therefore, this sample gives strong evidence that the town's mean birth weight is less than 3.500 grams this year