An important step in creating confidence intervals for
proportions is to check whether the success/failure conditions have
been met otherwise the interval created will not be valid (i.e. we
should not have created that interval)!
The following examples are estimating the proportion of people
in the population who exercise regularly. Try to determine whether
or not the assumptions have been met.
In a sample of 110 people surveyed, 25 exercised regularly.
(met or not met ? )
In a sample of 97 people surveyed, 9 exercised regularly.
(met or not met ? )
In a sample of 185 people surveyed, 15 exercised regularly.
(met or not met ? )
In a sample of 82 people surveyed, 71 exercised regularly.
(met or not met ? )
An important step in creating confidence intervals for proportions is to check whether the success/failure conditions ha
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