Which one of the following statements is false?
a. The standard error of a sample statistic measures, roughly, the average difference between the values of the statistic and the population parameter.
b. The standard error measures the variability of a population parameter.
c. The standard error of a sample proportion decreases as the sample size increases.
d. Assuming a fixed value of s = sample standard deviation, the standard error of the mean decreases as the sample size increases.