THE PLAN FOR DATA
COLLECTION AND ANALYSIS
Cher Ping was quite clear about how he intended to obtain his data. He writes:
This investigation will be explored from several different
perspectives. Average mid-year and final grade levels will
be obtained for both experimental and control groups and
differences between the two groups will be investigated. The
analysis will address the degree of change from mid-year to
final grades for each of the two groups… and findings will
be submitted to two sample t-tests with unequal ns to evaluate
differences between means for each group.
He selected t-tests because he wished to find out whether the difference between the two means was sufficiently large to suggest that it was not due to chance and because they were suitable for dealing with his small sample where the numbers (ns) in the groups did not necessarily have to be the same (there were 11 in the control group and 9 in the experimental group).