231 - 252 measurements
 

I need desperately to know the outside dimensions (length - width - height) of the 231 and 252 motors. Thanks

Oldgrunt

The alt hypothesis is given directly in the problem. The null hypothesis is exactly the opposite.
Using the standard deviation and sample size, calculate the standard error (aka, the standard deviation of the sample distribution). The test statistic is the number of standard errors between the sample mean and the hypothesized population mean -- i.e. 'Z'
Look up the area corresponding to Z in a standard normal calculator to determine 'p'

If you type that into google, (exactly like you did here), a website will come up that has all of those measurements. Its very helpful and you can save it to your favorites list. I use it all the time!