Statistical tests _____.
a. tell us whether the differences between groups are in all probability real or due to coincidence
b. make it hard to decide what the research findings mean
c. identify significant differences between the findings from the experimental and control groups
d. tell us about the similarities between groups by focusing on finding identical results between participants in the experimental group
e. tell us whether the differences between groups are in all probability real or due to coincidence and identify significant differences between the findings from the experimental and control groups
Question 2
The number of subjects needed for a study _____.
a. is determined by a mathematical formula and should be as small as possible
b. should be large enough to exclude differences between the control and experimental groups due to chance
c. should be kept small so that the data are manageable and there is less room for statistical error
d. is determined by a mathematical formula and should be large enough to exclude differences between the control and experimental groups due to chance
e. is determined by randomization and therefore, can be scaled as needed
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