Question: The plus four 90% confidence interval for the difference between the proportion of rats that succeed when given M and the proportion that succeed without

The plus four 90% confidence interval for the difference between the proportion of rats that succeed when given M and the proportion that succeed without it is

(a) 0.455 ± 0.312.

(b) 0.417 ± 0.304.

(c) 0.417 ± 0.185.

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