A regional town-planning department wants to determine the proportion of residential houses in its..

A regional town-planning department wants
to determine the proportion of residential houses in its region that have air
conditioning. To do so, a random sample of 80 houses across the region is
selected and 56 of those are found to have air-conditioning. From these data,
what is the 95% confidence interval for the proportion of residential houses
that have air conditioning in this region? What effect would an increase in the
confidence level have on this estimate?

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