The concept behind the use of a control chart to monitor a process mean is that sample means taken from the process vary around the process mean. If the sample mean varies too far from the process mean, the process mean may have shifted and is in need of adjustment. In other words, the process may no longer be in-controla. trueb. false

you have to email it to yourself from your phone then download it to either google drive or you computer files. then you can go to where ever you saved it and select it and then copy and paste it. or you could attach it to your question when you are writing it which would be much easier. for example: go to the attachment.

you can not change you age soon as you signed up. the only way is too delete your account and use another account to sign up and put your correct age.

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

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