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Topic: Choosing the Null Hypothesis
Replies: 3   Last Post: Jul 1, 1996 6:53 PM

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wayne benedict

Posts: 2
Registered: 12/18/04
Choosing the Null Hypothesis
Posted: Jun 27, 1996 3:20 AM
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Does anyone know of an easy way to identify the Null Hypothesis in word
questions? I find that sometimes it's the sample mean and others it's
the population mean. Take the following for example:

A local manufacturer of doors for use in home construction is attempting
to determine if the average height of adult males in it's market area
has changed from 70 inches. A sample of 121 men was randomly selected.
The average height was found to be 72 inches with a standard deviation
of 2 inches. At the 0.05 significance level, can we conclude that the
mean height has changed?

I thought that Ho:u=70 (the population mean) but it turns out to be 72
(the sample mean). Why?

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