When No Point Lies Outside the Control Limits of a Chart,we

question 87

Multiple Choice

When no point lies outside the control limits of a chart,we conclude that variation in the process is:

• A)caused by chance and there is not enough evidence to infer that the process is out of control.
• B)caused by chance and there is enough evidence to infer that the process is out of control.
• C)caused by assignable causes and there is enough evidence to infer that the process is under control.
• D)caused by assignable causes and there is not enough evidence to infer that the process is out of control.

Identify the conditions under which the F-test is appropriate for comparing two variances.

Calculate the F-test statistic for comparing two sample variances.

Determine the critical value and rejection region from the F-table.

Understand the role of sample size in the significance of the F-test.

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