Question

Carry out appropriate ANOVA using R, and show your conclusions. Show

the appropriate R commands used in reaching at the conclusion.

A study was carried out to compare the writing lifetimes of four premium brands of pens. It was thought that the writing surface might affect lifetime, so three different surfaces were randomly selected. A writing machine was used to ensure that conditions were otherwise homoge- neous (eg, constant pressure and a fixed angle). The accompanying table shows the two fems (min) obtained for each brand-surface combination Writing Surface 1 709, 659 713, 726 660, 645 4112 2 668, 685 722, 740 692, 720 4227 3 659, 685 666, 684 678, 750 4122 4 698, 650 704, 666 686, 7334137 Brand of Pen x5413 562 5564 16,598

Answer 1

Answer:

Given that:

Solution:-iven that →The pioblemtgam es Unearned Effects model ou hypO rupettei AHerafie d,"a2°Q3°@g扎) HIA:

Surface l Df | SS .IMS İf per) Surface 3 381.5 6250 0-68 0.5s3 Gtco-349 t2 | 8216.0 | 684.6そ totat

* the test Siatistic valce Coerondng to te has no Signifrart Etfedt