7. Experiments on learning in animals sometimes measure how long a laboratory rat takes to find its way through a maze.

7. Experiments on learning in animals sometimes measure how long a laboratory rat takes to find its way through a maze. Suppose for one particular maze, the mean time is known to be 20 seconds with a standard deviation of = 2 seconds. Suppose also that times for laboratory rats are normally distributed. A researcher decides to test whether rats exposed to cigarette smoke take longer on average to complete the maze. She exposes 25 rats to cigarette smoke for 15 minutes and then records how long each takes to complete the maze. The mean time for these rats is 20.6 seconds. Are these results significant at the = 0.05 level? Assume the researcher’s rats can be considered a SRS from the population of all laboratory rats.
a. Yes.
b. No.
c. The question cannot be answered since the results are not practically significant.

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