Trimmed mean because the mean is very sensitive to extreme values, we say that it is not a resistant measure of center. by deleting some low values and high values, the trimmed mean is more resistant. to find the 10% trimmed mean for a data set, first arrange the data in order, then delete the bottom 10% of the values and delete the top 10% of the values, then calculate the mean of the remaining values. use the axial loads (pounds) of aluminum cans listed below (from data set 30 “aluminum cans” in appendix b) for cans that are 0.0111 in. thick. an axial load is the force at which the top of a can collapses. identify any outliers, then compare the median, mean, 10% trimmed mean, and 20% trimmed mean.

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Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.

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