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1. True or False. (3 points each) a) If the focus of the study is using a sample to estimate a statistic for the entire population, you need a random sample, not a randomized experiment. b) A good method of sampling is sending an email to the population and using the information of whoever chooses to respond. C A confounding variable is a variable that is associated or influences both the explanatory and response variable. d) The mean is resistant to outliers. e) A z-score of 2.4 is more extreme than a z-score of -2.7. f) Dot plots are graphs used for quantitative variables. g A right-skewed graph is one that has a long right tail