Question: ******ATTACHED THE EXCEL SHEET ONCE DONE ******* and Please Answer All Highlighted Questions. Thank you! The hydrocarbon emissions at idling speed in parts per million

******ATTACHED THE EXCEL SHEET ONCE DONE *******

and

Please Answer All Highlighted Questions. Thank you!

******ATTACHED THE EXCEL SHEET ONCE DONE ******* and Please Answer All Highlighted

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: WIIMvllll I200 [223 I188 I940 I241 I190 I300 I435 I241 I380 1990 models: I140Il60|20 I20 I223 I60 I20 I95 I360 I70 WWWEEWWWEE o (3) Compute the sample means for the two years and superimpose the two means on the plots. Compute sample standard deviation for the two years a (b) Construct a relative frequency histogram of the 1980 data. 0 (c) Construct a stem-and-leaf display of the 1990 data. 0 ((1) Construct a dot plot. 0 (e) Comment on What the dot plot indicates regarding Whether or not the population emissions changed 'om 1980 to 1990. Use the concept of variability in your comments

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