The weights of a random sample of 11 female high school students were recorded. The mean weight was 110 pounds and the standard deviation was 17 pounds. If the sampling distribution is known to be approximately normal then what must be true?
a. By the central theorem, a sample size of 11 is considered to be sufficiently large to assume the sampling distribution is approximately normal.
b. By the central theorem, the population distribution must haven been normally distributed in order for the sampling distribution to have an approximate normal distribution.
c. By the central limit theorem, the population distribution must have been skewed to the left.
d. By the central limit theorem, the population distribution must have been uniformly distributed.