The main purpose of statistics is to test theories or results
from experiments. For example,
You might have invented a new fertilizer that you think makes
plants grow 50% faster.
In order to prove your theory is true, your experiment must:
a. Be repeatable
b. Be compared to a known fact about plants (In this example,
probably the average growth rate of plants without the fertilizer).
The rejection region (also called a critical region) is a part of the
testing process. Specifically, it is an area of probability that tells you if
your theory (hypothesis) is probably true.
=> Illustrate the rejection region(s), using your invented fertilizer
data aforementioned for the following questions:
1. Is the average growth rate greater than 10cm a day?
2. Is the average growth rate less than 10cm a day?
3.Is there a difference in the average growth rate in both directions
(greater than and less than)?
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