The average family size was reported as $5\mathrm{.}1.$ A random sample of families in a particular school district

resulted in the following family sizes:

At $=0\mathrm{.}1,$ does the average family size greater than the national average? Use traditional way of testing

hypothesis.

a$.$ Mean family size of the sample:

b$.$ Sample variance:

c$.t$ Test Value:

d$.$