Which statement is true?

A. A sample statistic can never be equal to the population parameter.
B. Point estimates are defined for both samples and populations.
C. To calculate a sample proportion, we need to know the population size.
D. To calculate a point estimate, we need to know the sample size.

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?