Perform the Indicated Sign Test $$\alpha = 0.05$$ $$\begin{array} { l l l l l l l l l l } 15.8 & 13.6 & 19.8 & 14.9 & 18 & 20.2 & 23.3 & 17.9 & 12.7 & 19\end{array}$$

Essay

Perform the indicated sign test. Be sure to do the following: Identify the claim mathematically and state the null and
alternative hypotheses. Determine the critical value and find the test statistic. Decide whether to reject or fail to reject
the null hypothesis and interpret the decision in the context of the original claim.
-A car dealer claims that its new model car still gets at least 21 miles per gallon of gas. Ten cars are tested. The
results are given below. Test the dealerʹs claim. Use $$\alpha = 0.05$$ $$\begin{array} { l l l l l l l l l l } 15.8 & 13.6 & 19.8 & 14.9 & 18 & 20.2 & 23.3 & 17.9 & 12.7 & 19\end{array}$$