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Fig. 3.8 Example of Item #15 of the NABT Survey
Essentially, the null hypothesis equal to 4 states that if the obtained mean score
for this question is not signiﬁcantly different from 4 on the rating scale, then
attendees, overall, were neither likely nor unlikely to recommend to colleagues
that they attend next year’s annual conference.
Suppose that your analysis produced the following conﬁdence interval for this
item on the survey.
- - - - - - - - - - - - - - - 1.8- - - - - - - - - - - - - - - 2.8- - - - - - - - - - - - - - - 3.8- - - - - - - - - - - - - - - 4- - - - - - - - - - - - - - -
lower
limit
Mean
upper
limit
Ref.
Value
Result: Since the reference value is outside the conﬁdence interval, we reject
the null hypothesis and accept the research hypothesis.
Rule #1: You must include the word “signiﬁcantly” since the reference value is
outside the conﬁdence interval
Rule #2: The key terms would be:
– attendees
– Internet survey
– signiﬁcantly
– NABT annual meeting this year
– either likely or unlikely (since the result is signiﬁcant)
– recommend to colleagues
– attend next year’s annual meeting of the NABT
Rule #3: Attendees at this year’s annual meeting of the NABT were signiﬁcantly
unlikely to recommend to colleagues that they attend next year’s annual
meeting of the NABT.
Note that you need to use the word “unlikely” since the sample mean of 2.8 was
on the unlikely side of the middle of the rating scale.
CASE #3:
The National Association of Biology Teachers (NABT) publishes the
journal: The American Biology Teacher which includes articles
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