The Heights (In Inches)of 20 Randomly Selected Adult Males Are $\alpha$

Essay

The heights (in inches)of 20 randomly selected adult males are listed below. Test the claim that the variance is
less than 6.25. Assume the population is normally distributed. Use $\alpha$ = 0.05 and confidence intervals. $$\begin{array} { l l l l l l l l l l } 70 & 72 & 71 & 70 & 69 & 73 & 69 & 68 & 70 & 71 \\67 & 71 & 70 & 74 & 69 & 68 & 71 & 71 & 71 & 72\end{array}$$