Question 1205517


A study on the length of time a person brushes their teeth is conducted on a large population of adults. 
The mean brushing time is {{{mu}}} and the standard deviation is {{{sigma}}}. 
A simple random sample of {{{270}}} adults is considered.

(a) The mean of the sampling distribution is {{{equal}}}{{{ to }}}the mean of the population.
(b) The standard deviation of the sampling distribution is {{{less}}}{{{ than}}} the standard deviation of the population.

Explanation:
means are {{{equal }}}to each other
standard deviation is {{{always}}}{{{ less}}}