Do men with children tend to live longer, on average,than those without? To investigate, a group of Cal Poly students randomly sampled men from the obituaries page on the San Luis Obispo Tribune€™s webpage between June and November 2012. For each man selected, they noted the age at which the person died and whether or not the person had any children.
a. Identify the observational/experimental units, explanatory variable, and response variable in this study.
b. Is this an observational study or an experiment? Explain briefly. The students€™ data are in the file ChildrenandLifespan.
c. Using an appropriate applet (e.g., the Multiple Means applet) find and record the following summary statistics for the lifespan of men by whether or not the man had children:

d. Find and report the difference in the average lifespan of men with versus without children.
e. Give two possible explanations for the observed difference in average lifespan reported in part (d).

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Sample size Sample mean Sample SD Had children No children