A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results

Machine	Total Defectives
#1	23
#2	15
#3	29
#4	13

For upper and lower control limits of .026 and .014, which machine(s), if any, appear(s) to be out-of-control for process proportion of defectives?

Multiple Choice

machines #2 and #3

none of the machines

machine #4

machines #3 and #4

machine #3