In a psychology testing experiment 25 subjects are selected randomly and their r

Question

In a psychology testing experiment 25 subjects are selected randomly and their reaction time in seconds to a particular stimulus is measured. Past experience suggests that the variance in reaction times to these types of stimuli is 4 seconds and that the distribution of reaction times is approximately normal. The average time for the 25 subjects is 6.4 seconds. Researchers would like to estimate the average reaction time.   Calculate a 90% confidence interval for the average reaction time.   

State: (2 point) What is the practical question that requires estimating a parameter?

Plan: (3 points) Identify the parameter, state the level of confidence, and select the type of confidence interval that fits your situation.

Explanation / Answer

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