In an experiment to learn whether Substance M can help restore memory, the brains of 20 rats
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In an experiment to learn whether Substance M can help restore memory, the brains of 20 rats were treated to damage their memories. First, the rats were trained to run a maze. After a day, 10 rats
(determined at random) were given M and 7 of them succeeded in the maze. Only 2 of the 10 control rats were successful. The two-sample z test for “no difference”
against “a significantly higher proportion of the M group succeeds”
(a) gives z = 2.25, P < 0.02.
(b) gives z = 2.60, P < 0.005.
(c) gives z = 2.25, P < 0.04 but not < 0.02.
(d) should not be used because the Random condition is violated.
(e) should not be used because the Large Counts condition is violated.
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