The answer is not C

A physician who has delivered babies for over 20 years claims that babies tend to weigh more at birth than their next older sibling. To verify the doctor's statement, her office assistant takes a random sample of 15 mothers with at least two children (from the hospital records) and records the birthweights of the first two children (in pounds). Birth Weight of 5. S. next older sibling Birth Weight of 6.4 5.8 5.3 younger sibling 45 6.6 5.3 Difference 1.3 0.6 0.7 0.8 12 0.6 2.4 0.7 O.S 07 0.6 Which of the following is the correct value and interpretation of the standard deviation of the differences (younger sibling - next older sibling)? Select one: a. 0.483. The weight of the younger sibling tends to be 0.483 pounds greater, on average, than their next older sibling. O b. 0.483. The mean difference (younger sibling - next older sibling) in birth weight tends to vary, on average, 0.483 pounds from a mean difference of zero pounds. c. 0.893. The weight of the younger sibling tends to be 0.893 pounds less, on average, than their next older sibling. x O d. 1.24 and 1.46. The standard deviation of the weights of the younger sibling tends to be 1.24 pounds and the standard deviation of the weights of the next older sibling tends to be 1.46 pounds, on average. e. 0.483. The mean difference (younger sibling - next older sibling) in birth weight tends to vary, on average, 0.483 pounds from a mean difference of zero pounds