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

What is the sample proportion of defectives for machine #1?

Group of answer choices

.023

.02

.0115

.0058

.005

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results

Machine	Measurements
#1	17	15	15	17
#2	16	25	18	25
#3	23	24	23	22

For upper and lower control limits of 23.29 and 16.71, which machine(s), if any, appear(s) to have an out-of-control process mean?

Group of answer choices

machine #1

machine #2

machine #3

all of the machines

none of the machines