Microsoft Office Tutorials and References

In Depth Information

3.2.2.1 Determining the Null Hypothesis and the Research Hypothesis

When Rating Scales are Used

Here is a typical example of a 7-point scale in science education for parents of 8th

grade pupils at the end of a school year (see Fig.
3.6
):

Fig. 3.6

Example of a rating scale item for parents of 8th graders (practical example)

So, how do we decide what to use as the null hypothesis and the research

hypothesis whenever rating scales are used?

Objective: To decide on the null hypothesis and the research hypothesis

whenever rating scales are used.

In order to make this determination, we will use a simple rule:

Rule: Whenever rating scales are used, we will use the ‘‘middle’’ of the scale as the

null hypothesis and the research hypothesis.

In the above example, since 4 is the number in the middle of the scale (i.e.,

three numbers are below it, and three numbers are above it), our hypotheses

become:

Null hypothesis: l
¼
4

Research hypothesis: l
6¼
4

In the above rating scale example, if the result of our statistical test for this one

attitude scale item indicates that our population mean is ‘‘close to 4,’’ we say that

we accept the null hypothesis that the parents of 8th grade pupils were neither

satisﬁed nor dissatisﬁed with the quality of the science program offered by their

son’s or daughter’s school.

In the above example, if the result of our statistical test indicates that the

population mean is signiﬁcantly different from 4, we reject the null hypothesis and

accept the research hypothesis by stating either that:

‘‘Parents of 8th grade pupils were signiﬁcantly satisﬁed with the quality of the

science program offered by their son’s or daughter’s school’’(this is true whenever

our sample mean is signiﬁcantly greater than our expected population mean of 4).

Search JabSto ::

Custom Search