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please give me answers this question The hydrocarbon emissions at idling speed in parts per million (ppm) for automobiles of 1980 and 1990 are given for 20 randomly selected cars. 1980 models: a) Construct a dot plot b) Compute the sample means for the two years and superimpose the two means on the plots. c) Comment on what the dot plot indicates regarding whether or not the population emissions changed from 1980 to 1990. Use the concept of variability in your comments.