Question

A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are under 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: Show your work.

Machine Total Defectives
1 23
2 15
3 29
4 13
What is the sample proportion of defectives for machine # 1?
A) .023
B) .02
C) .0115
D) .0058
E) .005

Answer 1

A) 0.023

Step-by-step explanation:

Sample size = 1,000

Number of defectives collected from Machine #1 = 23

So, the sample proportion of defectives for machine #1 = Number of defective output / Sample size = 23/1000 = 0.023