The Local Newspaper Receives Several Complaints Per Day About Typographic $\bar x$

Multiple Choice

The local newspaper receives several complaints per day about typographic errors. Over a seven-day period, the publisher has received calls from readers reporting the following number of errors: 4, 3, 2, 6, 7, 3, and 9. Based on these data alone, what type of control chart(s) should the publisher use?

A) p-chart
B) c-chart
C) $\bar x$ -chart
D) R-chart
E) $\bar x$ - and R-charts