A study was carried out to compare the writing lifetimesof four premium brands of pens. It was thought that thewriting surface might affect lifetime, so three differentsurfaces were randomly selected. A writing machine wasused to ensure that conditions were otherwise homogeneous(e.g., constant pressure and a fixed angle). Theaccompanying table shows the two lifetimes (min)obtained for each brandsurface combination.Writing Surface 1 2 3 xi??1 709, 659 713, 726 660, 645 4112Brand 2 668, 685 722, 740 692, 720 4227of Pen 3 659, 685 666, 684 678, 750 41224 698, 650 704, 666 686, 733 4137x?j? 5413 5621 5564 16,598Carry out an appropriate ANOVA, and state yourconclusions.

Statistics 41 Week 3 Chapter 3 Part 2 ➪Coefficient of Variation (CV): measures the spread of the data relative to the mean of the data; measured as a percentage Standard deviation ÷ mean = CV (multiply a nswer b y 100 ake it ercentage) ● A smaller CV indicated a higher consistency,...