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  3. psychologists often measure how long it takes mice

Psychologists often measure how long it takes mice to find their way through a maze...

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Psychologists often measure how long it takes mice to find their way through a maze The times for one particular maze follow an approximately Normal distribution with mean 18 seconds and standard deviation 3 seconds A researcher thinks that a loud noise will cause mice to complete the maze faster but not change the standard deviation She uses a loud noise to stimulate each of 10 mice right before she measures how long it takes each of them to complete the maze The sample mean is 16 2 seconds The appropriate null and alternative hypotheses for this test are Ho 18 seconds Ha 18 seconds The sample result is a not statistically significant at any level b statistically significant at the 5 level but not at the 2 level c proves that the mean time after a loud noise has changed to 116 2 seconds

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