Business, 16.12.2021 02:20, Sumitco9578

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each. Weight
Day Package 1 Package 2 Package 3 Package 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

Required:
a. Calculate Ï x-bar chart control limit that allow for natural variations.
b. Based on the x-bar chart, is this process in control?

Answers: 1

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A quality analyst wants to construct a sample mean chart for controlling a packaging process. He kno...