The hydrocarbon emissions at idling speed in parts per
Chapter 2, Problem 1.23(choose chapter or problem)
The hydrocarbon emissions at idling speed in parts per million (ppm) for automobiles of 1980 and 1990 model years are given for 20 randomly selected cars.
1980 models:
141 359 247 940 882 494 306 210 105 880
200 223 188 940 241 190 300 435 241 380
1990 models:
140 160 20 20 223 60 20 95 360 70
220 400 217 58 235 380 200 175 85 65
(a) Construct a dot plot as in Figure 1.1.
(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.
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