In fuel economy tests in city driving conditions, a hybrid vehicle's mean was 43.2 mpg with a standard deviation of 2.2 mpg. A comparably sized gasoline vehicle's mean was 27.2 mpg with a standard deviation of 1.9 mpg. Which vehicle's mpg was more consistent in relative terms?
Answer to relevant QuestionsFind the mean absolute deviation (MAD) of these five numbers: 12, 18, 21, 22, 27. An exam has a mean of 70 with a standard deviation of 10. Use Chebyshev's Theorem to find a lower bound for the number of students in a class of 400 who scored between 50 and 90. An executive's telephone log showed the lengths of 65 calls initiated during the last week of July. (a) Use Excel or MegaStat to sort and standardize the data. (b) Based on the standardized z-scores, are there outliers? ...For each X-Y data set (n = 12): (a) Make a scatter plot. (b) Find the sample correlation coefficient. (c) Is there a linear relationship between X and Y? If so, describe it. Scores are shown for the most recent state civil service exam taken by 24 applicants for positions in law enforcement. (a) Calculate the mean, median, and mode. (b) Is the distribution skewed? Explain. (c) Is the mode a ...
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