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tethead tethead
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6 years ago
How would a psychologist figure how many participants would be needed for 80% power in a study using a t test for dependent means in which a large effect size is predicted?
A) Look up the needed number of participants in a table based on whether a one-tailed or two-tailed test will be conducted.
B) Figure the power using the standard formulas, but assuming a 20% loss of participants.
C) Look up the needed number of participants in a table based on the number of degrees of freedom.
D) Power cannot be determined without knowing the length of time between testings.
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ErhardtErhardt
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6 years ago
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tethead Author
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6 years ago
Thanks
dri
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Yesterday
Helped a lot
bkrandy
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2 hours ago
Smart ... Thanks!
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