Question: A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that the process standard deviation

A quality analyst wants to construct a sample mean chart for

controlling a packaging process. He knows from past experience that the

process standard deviation is two ounces. Each day last week, he

randomly selected four packages and weighed each. The data from that

activity appear below.

Weight

Day pkg 1 pkg 2 pkg 3 pkg 4

monday 23 22 23 24

tuesday 23 21 19 21

wednesday 20 19 20 21

thursday 18 19 20 19

friday 18 20 22 20

what is the upper control limit (ucl) for R chart? must compute each value in 4 dec pl. choose closest one.

a. ucl for r chart = 4.0457 ounces

b. ucl for r chart = 5.9220 ounces

c. ucl for r chart = 6.3896 ounces

d. ucl for r chart = 4.8369 ounces

e. ucl for r chart = 5.0836 ounces

what is the average of sample ranges in thr random samples? must compute in 2 dec pl.

a. r-bar = 14.00 ounces

b. r-bar = 2.80 ounces

c. r-bar = 2.06 ounces

d. r-bar = 3.50 ounces

e. r-bar = 7.00 ounces

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