As was mentioned earlier, sometimes we cannot survey or
test all persons or objects; therefore, we have to take a sample.
From the results of analysis from the sample data, we can predict
the results from the populati
...
As was mentioned earlier, sometimes we cannot survey or
test all persons or objects; therefore, we have to take a sample.
From the results of analysis from the sample data, we can predict
the results from the population. Some questions that one may want
to answer are
1. Are unmarried workers more likely to be absent from work than
married workers?
2. Are the sixth graders in a certain school significantly less skilled
in their mathematical abilities than the average student in the
district?
3. In Fall 1996, did students in Math 163-01 score the same on the
exam as students in Math 163-02?
4. Is there any difference between the strengths of steel wire
produced by the XY Company and Bob’s Wire Company?
5. A hospital spokesperson claims that the average daily room
charge for a specific procedure is $622. Can we reject this
claim?
WHAT IS A HYPOTHESIS?
Hypothesis: A statement about the value of a population parameter
developed for the purpose of testing.
Examples of hypotheses, or statements, made about a population
parameter are:
The mean monthly income from all sources for systems analysts is
$3,625.
Twenty percent of all juvenile offenders ultimately are caught and
sentenced to prison.
Hypothesis testing: A procedure, based on sample evidence
and probability theory, used to determine whether the
hypothesis is a reasonable statement and should not be
rejected, or is unreasonable and should be rejected.
lFollowing is a five-step procedure for testing a hypothesis.
5 STEPS IN THE HYPOTHESIS TESTING PROCEDURE
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