Reliability of reverse-cycle air conditioners

When the variable of most interest has only two categories and all probabilities for one category are small, standard clustered and stacked bar charts do not display differences between the groups well.

Choose Propns for Needed repair to show a simple bar chart of the proportions.

The Australian consumer magazine Choice conducted a survey of subscribers in November 1995 to assess reliability of air conditioners. Each respondent who owned an air conditioner was asked about the brand and whether it had needed any repairs in the previous 12 months.

Brand Sample size Percentage
requiring repairs
Panasonic
Sanyo
Fujitsu
Westinghouse
Mitsubishi
Emailair
Kelvinator
Carrier
169
51
77
99
85
104
188
169
2
6
7
7
9
13
13
15