Experiments on learning in animals sometimes measure how long it takes for mice

Question

Experiments on learning in animals sometimes measure how long it takes for mice to find their way through a maze. The mean time is 18 seconds for one particular maze. A researcher thinks that a loud noise will cause the mice to complete the maze faster. She measures how long each of 36 randomly selected lab mice takes with noise as stimulus. Her sample data yielded a mean of 16.5 seconds and a standard deviation of 6.4 seconds.

What are the appropriate null and alternative hypotheses?

A group of 121 Internet users 50-65 years of age were randomly chosen and asked to report the weekly number of hours they spend online. The purpose of the study was to determine whether the mean weekly number of hours that Internet users in that age group spend online differs from the mean for Internet users in general which is 12.50 hours. A 95% confidence interval for the mean weekly number of hours that Internet users in that age group spend online was calculated to be (11.439 , 12.577). On the basis of this interval, at = 0.05, what can she conclude about H0: = 12.50 versus Ha: 12.50? Reject H0 since 12.50 is inside the given interval. Reject H0 since 12.50 is outside the given interval. Fail to reject H0 since 12.50 is inside the given interval. Fail to reject H0 since 12.50 is outside the given interval.

Explanation / Answer

question 1

from scenario 2

Fail to reject H0 since 12.50 is inside the given interval.

question 2)

p-value is less than = 0.05, therefore, we reject the null hypothesis

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