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Hypothesis Test - Mean

Author: mary daunis

Mean - Part 1

Part 1 gives the set-up to the problem. We will figure out what the Claim, Null and Alternative hypotheses are. Then, we will settle on the correct distribution and see where the critical region is.

Mean - Part 2

In the second part we calculate the test statistic and determine the critical value.

Mean - Part 3

We finish off this example by giving "regular language" wording to the final conclusion - it is important to do this so that an average person looking at your results will know what you mean by your conclusion.

Another Look at the Light Bulb Claim - Manufacturer's Perspective

The manufacturer is concerned with establishing the validity of the claim that the light bulbs last at least as long as 250 hours - so the claim is stated as such.

Another Look at the Light Bulb Claim - Consumer's Perspective

The consumer is concerned with faulty light bulbs - those that do not meet the manufacturer's stated burnout time - and so will state the claim to reflect that concern - bulbs last for a shorter time than the manufacturer says they do.