Chlorofluorocarbons (CFCs) are used in air conditioners. However, CFCs damage the ozone layer, which protects us from the sun’s harmful rays. As a result many jurisdictions have banned the production...

Chlorofluorocarbons (CFCs) are used in air conditioners. However, CFCs damage the ozone layer, which protects us from the sun’s harmful rays. As a result many jurisdictions have banned the production and use of CFCs. The latest jurisdiction to do so is the province of Ontario, which has banned the use of CFCs in car and truck air conditioners. However, it is not known how many vehicles will be affected by the new legislation. A  survey of 650  vehicles was undertaken. Each vehicle was identified as either using CFCs (2) or not (1). If there are 5 million vehicles registered in Ontario, estimate with 95% confidence the number of vehicles affected by the new law.