TABLE 12-3
a Computer Used by a 24-Hour Banking Service

Multiple Choice

TABLE 12-3
A computer used by a 24-hour banking service is supposed to randomly assign each transaction to one of 5 memory locations. A check at the end of a day's transactions gave the counts shown in the table to each of the 5 memory locations, along with the number of reported errors.
$$\begin{array}{l}\begin{array} { l l l l l r } \hline \text { Memory Location: } & 1 & 2 & 3 & 4 & 5 \\\hline \text { Number of Transactions: } & 82 & 100 & 74 & 92&102\\\text { Number of Reported Errors: } & 11 & 12 & 6 & 9 & 10\end{array}\\\begin{array} { l l l l l l } \end{array}\end{array}$$ The bank manager wanted to test whether the proportion of errors in transactions assigned to each of the 5 memory locations differ.
-Referring to Table 12-3, the degrees of freedom of the test statistic is

A) 10.
B) 4.
C) 8.
D) 448.