A Consumer Psychologist Wishes to Determine Whether Playing Music Increases

Multiple Choice

A consumer psychologist wishes to determine whether playing music increases sales. The owner plays no music, soft rock, classical, or jazz and notes the sales for 28 people under these conditions. The following numbers are in dollar amounts per shopper. $\begin{array} { c c c c } \hline \text { No Music } & \text { Soft Rock } & \text { Classical } & \text { Jazz } \\\hline 128 & 57 & 87 & 55 \\101 & 32 & 40 & 24 \\157 & 93 & 21 & 95 \\196 & 35 & 92 & 19 \\163 & 58 & 55 & 60 \\144 & 61 & 59 & 85 \\170 & 82 & 39 & 54 \\\hline\end{array}$
-The degrees of freedom for the denominator (df₂) is

A) 3
B) 24
C) 27
D) 28