Mathematics, 16.11.2020 17:50 tionnewilliams21

Knowing that that a particular laboratory task takes the average person 2.5 seconds (the variance is not known). A researcher was interested in whether older people are slower (take longer) on this task. The researcher tested 30 randomly selected 80-year-olds. Their mean time was 2.7 seconds, with an estimated population standard deviation of 1.4 seconds. What should the researcher conclude?

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Knowing that that a particular laboratory task takes the average person 2.5 seconds (the variance is...