A chain of automotive repair stores wishes to estimate, to within five
percentage points, the proportion of all passenger vehicles in operation
that are at least five years old, with 98% confidence. Estimate the
minimum size sample required.
I am not finding complete data !!!
we have given E = 5% or 0.05
std deviation (sigma) = ?
and Z(alpha/2) = Zscore at 98% Confidence level
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