Question: 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 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

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