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It is known that a particular laboratory decision task takes the average person 2.5 seconds. Wondering...

It is known that a particular laboratory decision task takes the average person 2.5 seconds. Wondering whether older people are slower (take longer) on this task, the researcher tested 30 randomly selected 80 year olds. Their mean reaction time was 2.7 seconds, with an estimated population standard deviation of 1.4 seconds. What should the researcher conclude (use the 2-tailed .05 level)?

Use the 5 steps of hypothesis testing!

Math   Statistics-And-Probability   
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