A researcher is studying the average lifespan of Durham residents who were born between 1905 and 1915 and who lived at least five (5) years. The researcher suspects the average age-at-death for that population was less than 53 years. The researcher plans to use level of significance 0.1. For a random sample of size 50, the mean age-at-death is 57.4 years with SD 13.4. Decide whether the researcher should reject the null hypothesis and explain clearly how you decided. Then state the conclusion of the study. A. The researcher should reject the null hypothesis B. The researcher should not reject the null hypothesis

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