Customers' Ages
the Marketing Manager of a Hot Dog Stand

Customers' Ages
The marketing manager of a Hot Dog Stand chain is in the process of examining some of the demographic characteristics of her customers.In particular,she would like to investigate the belief that the ages of the customers of hot dogs,fast-food hamburger,and fast-food chicken restaurants are different.To test this belief,the ages of eight randomly selected customers from each restaurant type were recorded and listed below.From previous analysis we know that the ages are not normally distributed.
$$\begin{array}{l}\text { Customers' Agas }\\\begin{array} { | c c c | } \hline \text { Hot Dogs } & \text { Hamburger } & \text { Chicken } \\\hline 23 & 26 & 25 \\19 & 20 & 28 \\25 & 18 & 36 \\17 & 35 & 23 \\36 & 33 & 39 \\25 & 25 & 27 \\28 & 19 & 38 \\31 & 17 & 31 \\\hline\end{array}\end{array}$$
-The data below are drawn from four independent populations:
$$\begin{array}{l}\text { Sampla }\\\begin{array} { | c c c c | } \hline 1 & 2 & 3 & 4 \\\hline 13 & 15 & 18 & 9 \\9 & 10 & 15 & 10 \\16 & 15 & 17 & 6 \\12 & 14 & 18 & 6 \\15 & & 13 & \\8 & & &\end{array}\end{array}$$ Test at the 1% significance level to determine whether the population locations differ.