Question

Asked Jan 18, 2020

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Car Batteries Defective car batteries are a nuisance because they can strand and inconvenience drivers, and drivers could be put in danger. A car battery is considered to be defective if it fails before its warranty expires. Defects are identified when the batteries are returned under the warranty program. The Powerco Battery corporation manufactures car batteries in batches of 250, and the numbers of defects are listed below for each of 12 consecutive batches. Does the manufacturing process require correction?

Step 1

Note: In this context, the software usage is not mentioned. In order to obtain the *chart*, we have used MINITAB software to solve the problem.

Step 2

*Requirements for out-of-control state:*

A process is said to be out-of-statistical control if any one of the following requirements are satisfied:

- There exists an upward or downward trend or a cyclic pattern.
- If a sample point lies below the lower control limit or above the upper control limit.
- There exists at least 8 consecutive sample points above or below the central line. It is known as Run Rule of 8.

Step 3

Software procedure using the MINITAB software:

- Choose
**Stat > Control Charts > Attributes Charts > P**. - In
**Variables**, enter columns**Number of Defecti...**

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