Confidence Intervals and Effect Size. A professor is studying the effects of observation on reaction times. He knows that for people who are not being observed, the population’s average reaction time for his task is 750ms and the standard deviation is 12ms. Dr. Heisenberg takes a sample of 16 people and observes them while doing a task and then measures their reaction times. He finds that the average reaction time for his sample is 744ms.   What are the upper and lower limits for a 95% confidence interval around the sample mean?             Upper Limit:_____________             Lower Limit:______________   What is the effect size (d) for the above example? _______________   Is that effect size closest to a small, medium, or large effect?______________

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Confidence Intervals and Effect Size. A professor is studying the effects of observation on reaction times. He knows that for people who are not being observed, the population’s average reaction time for his task is 750ms and the standard deviation is 12ms. Dr. Heisenberg takes a sample of 16 people and observes them while doing a task and then measures their reaction times. He finds that the average reaction time for his sample is 744ms.

 

  • What are the upper and lower limits for a 95% confidence interval around the sample mean?

            Upper Limit:_____________

            Lower Limit:______________

 

  • What is the effect size (d) for the above example? _______________

 

  • Is that effect size closest to a small, medium, or large effect?______________