Question

Andrew took a random sample of 10 decorated ceramic cups from a population of 100 cups to determine the sample mean number of defective cups. Barbara took another random sample of 10 cups from the same population to do the same thing. What would happen if Andrew and Barbara instead chose samples of size 20?
a. the difference between their sample means would likely reduce.
b. the difference between their sample mean would likely increase.
c. the difference between their sample means would likely stay the same.
d. there is not sufficient date to answer this question.