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4.2 One-Group t-test for the Mean
The American Institute of Biological Sciences (AIBS) is a non-profit scientific
association dedicated to advancing biological research and education. It has more
than 150 member organizations. AIBS publishes a peer-reviewed monthly journal
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 :
Fig. 4.1
Sample survey item for item #7 of the AIBS survey (practical example)
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
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
onegroup t-test for each survey item.
Create an Excel spreadsheet with the following information:
Null hypothesis:
Research hypothesis:
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