2) A neurologist is testing the effect of a drug on response time by injecting 27 rats with a unit dose of the drug, subjecting each to neurological stimulus, and recording its response time. The neurologist knows that the mean response time for rats not injected with the drug is 1.1 seconds. The mean of 27 injected rats' response time is 1.003 seconds with a sample standard deviation of 0.012 seconds. Do you think that the drug has an effect on response time?

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