19 It is known from historical data that 15\% of the residents of a town buy the local weekly newspaper, 'Local News'. A new free weekly paper is introduced into the town.
The owners of 'Local News' are interested to know whether the introduction of the free newspaper has changed the proportion of residents who buy their paper. In a random sample of 50 residents of the town taken after the free newspaper was introduced, it was found that 3 of them purchased 'Local News' regularly. Investigate, at the \(5 \%\) significance level, whether this sample provides evidence that the proportion of local residents who buy 'Local News' has changed.
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