# Statistical Quality Control- Mean and Range Chart

Not what you're looking for?

1. Statistical Quality Control- Mean and Range Chart

A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter. The quality control inspector randomly selected five slugs each hour, measured the outside diameter, and recorded the results. The measurements (in millimeters) for the period 8:00 A.M. to 10:30 A.M. follow:

Outside diameter (mm)

Time 1 2 3 4 5 Mean Range

8:00 87.1 87.3 87.9 87.0 87.0 87.26 0.9

8:30 86.9 88.5 87.6 87.5 87.4 87.58 1.6

9:00 87.5 88.4 86.9 87.6 88.2 87.72 1.5

9:30 86.0 88.0 87.2 87.6 87.1 87.18 2

10:00 87.1 87.1 87.1 87.1 87.1 87.1 0

10:30 88.0 86.2 87.4 87.3 87.8 87.34 1.8

a. Determine the control limits for the mean and the range.

b. Plot the control limits for the mean outside diameter and the range.

c. Are there any points on the mean or the range chart that are out of control? Comment

on the chart.

[use Megastat, quality control process charts or use Phstat, mean and range control charts.

##### Purchase this Solution

##### Solution Summary

Quality control statistics is examined for mean and range charts.

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.