Random samples of size 81 are taken from a process (an infinite population) whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are:.
A. 200 and 18
B. 81 and 18
C. 9 and 2
D. 200 and 2
The events being female and being in favor of flexible hours
A. are mutually exclusive
B. are independent
C. are contiguous
D. are dependent.