6.2.4 WP An article in Technometrics ["Validation of Regres- sion Models: Methods and Examples” (1977, Vol. 19(4), p. 42

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6 2 4 Wp An Article In Technometrics Validation Of Regres Sion Models Methods And Examples 1977 Vol 19 4 P 42 1 (112.86 KiB) Viewed 192 times

6.2.4 WP An article in Technometrics ["Validation of Regres- sion Models: Methods and Examples” (1977, Vol. 19(4), p. 425)] presented the following data on the motor fuel octane ratings of several blends of gasoline: 88.5 98.8 88.4 87.5 90.9 89.6 90.4 92.2 92.7 83.4 87.9 94.7 88.3 92.6 87.8 89.9 84.3 91.6 91.0 91.8 90.4 91.2 93.0 94.4 88.3 89.2 90.1 90.7 93.7 96.5 84.3 88.2 89.7 89.0 90.6 88.6 88.5 90.4 92.3 92.2 89.8 92.2 88.3 93.3 91.2 93.2 88.9 91.6 87.7 94.2 87.4 86.7 88.6 89.8 85.3 91.1 94.2 90.8 88.7 92.7 92.7 93.3 90.1 90.5 90.3 91.1 90.0 86.7 91.5 93.4 89.9 96.1 89.3 100.3 90.1 89.3 86.7 87.6 91.8 91.8 91.0 91.0 91.1 Construct a stem-and-leaf display for these data. Calculate the median and quartiles of these data.