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You are arguing with your lab mates what is the mean life span in the US today

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You are arguing with your lab mates what is the mean life span in the US today. Your mate Sammy's guess is that it is greater than 71 years. To challenge her, you obtain a random sample of 100 recorded deaths in the US, selected so that it is representative of the whole population. From your sample, you calculate a mean life span of 72.1 years and a standard deviation of 5.7 years.

- Select an appropriate statistical test and formulate Sammy's guess in terms of an appropriate null hypothesis and alternative hypothesis for your test about the population mean life span.

- Having chosen a level of significance a = 0.05, perform your statistical test and decide whether to reject or not the null hypothesis.

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[Solved] You are arguing with your lab mates what is the mean life span in the US today

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