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Fig. 4.1 Sample Survey Item for Item #7 of the AIBS Survey (Practical Example)
called BioScience . Its Website links to Career Possibilities for biologists in
academics, government, and private industry. Let’s suppose that AIBS has sent
an Internet survey to its members asking them to evaluate its Website in terms of its
career possibilities section.
The survey contains a number of items, but suppose a hypothetical Item #7 is the
one in Fig. 4.1 :
Suppose further, that you have decided to analyze the data from members using
the one-group t-test.
Important note: You would need to use this test for each of the survey items
separately.
Suppose that the hypothetical data for Item #7 of the AIBS Website were based
on a sample size of 124 members who had a mean score on this item of 6.58 and a
standard deviation on this item of 2.44.
Objective : To analyze the data for each question separately using
the one-group t-test for each survey item.
Create an Excel spreadsheet with the following information:
B11: Null hypothesis:
B14: Research hypothesis:
Note: Remember that when you are using a rating scale item, both the null
hypothesis and the research hypothesis refer to the “middle of the scale.” In the
10-point scale in this example, the middle of the scale is 5.5 since five numbers are
below 5.5 (i.e., 1-5) and five numbers are above 5.5 (i.e. 6-10). Therefore, the
hypotheses for this rating scale item are:
H 0 :
m
5.5
H 1 :
m
5.5
B17: n
B20: mean
B23: STDEV
B26: s.e.
B29: critical t
B32: t-test
B36: Result:
B41: Conclusion:
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