1. The purpose of statistical inference is to provide information about the.
   
   

Asample based upon information contained in the population.

Bpopulation based upon information contained in the sample.

Cpopulation based upon information contained in the population.

Dmean of the sample based upon the mean of the population.

1. Random samples of size 81 are taken from 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 mean are.
   
   

A200 and 18.

B81 and 18.

C9 and 2.

D200 and 2.