An optometrist wishes to know the proportion of patients who undergo laser eye surgery who end up with 20/20 vision or better following the surgery. If the optometrist wishes to achieve an accuracy...

An optometrist wishes to know the proportion of patients who undergo laser eye surgery who end up with 20/20 vision or better following the surgery. If the optometrist wishes to achieve an accuracy within 0.05 at the 2% level of significance, what size sample is required if there is NO preliminary notion of the true proportion for this study?