The Owners of a Coffee Stand Hypothesize That the Median $\begin{array} { l l l l l l l l l l l l l l l } 18 & 24 & 21 & 17 & 22 & 23 & 24 & 22 & 19 & 22 & 21 & 23 & 21 & 16 & 21 \end{array}$

The owners of a coffee stand hypothesize that the median number of sales during the hour from 10:00 AM to 11:00 AM is 2 0. They tabulated the following random sample of the number of sales during the time period.
$\begin{array} { l l l l l l l l l l l l l l l } 18 & 24 & 21 & 17 & 22 & 23 & 24 & 22 & 19 & 22 & 21 & 23 & 21 & 16 & 21 \end{array}$
Use the $\alpha = 0.05$ level of significance and provide the following to provide the fol information:
a. State appropriate null and alternate hypotheses.
b. Compute the test statistic.
c. Find the critical value.
d. State a conclusion.