Data on the cut-off times of lawnmowers was collected. 3 machines were randomly selected from those produced by manufacturers A and B. Each machine was tested twice at low speed and high speed.
data(lawn)
A data frame with 24 observations on the following 4 variables.
manufact
Manufacturer - a factor with levels A
B
machine
Lawn mower - a factor with levels m1
m2
m3
m4
m5
m6
speed
Speed of testing - a factor with levels H
L
time
cut-off time