Express the Null Hypothesis $\mathrm { H } _ { 0 }$

Multiple Choice

Express the null hypothesis $\mathrm { H } _ { 0 }$ and the alternative hypothesis $\mathrm { H } _ { 1 }$ in symbolic form. Use the correct symbol ( $\mu , \mathrm { p }$ , $\sigma$ ) for the indicated parameter.
-The principal of a middle school claims that test scores of the seventh-graders at her school vary less than the test scores of seventh-graders at a neighboring school, which have variation described by $\sigma = 14.7$ .

A) $\begin{array}{l}\mathrm{H}_{0}: \sigma=14.7 \\\mathrm{H}_{1}: \sigma<14.7\end{array}$

B) $\begin{array}{l}\mathrm{H}_{0}: \sigma=14.7 \\\mathrm{H}_{1}: \sigma>14.7\end{array}$

C) $\begin{array}{l}\mathrm{H}_{0}: \sigma<14.7 \\\mathrm{H}_{1}: \sigma>14.7\end{array}$

D) $\begin{array}{l}H_{0}: \sigma>14.7 \\H_{1}: \sigma \leq 14.7\end{array}$