A confidence interval of 90 was used to estimate the proport

A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 100 customers produced a confidence interval of: 49% +/- 4%. What is the best way to explain the result?

Solution

The 90% confidence interval means that there are 90% chance that the population parameter lies within the limits of the interval.

Here the lower limit of the interval is 49% -4%=45%

and the upper limit of the interval is 49%+4%=53%

Hence there is 90% chance that the proportion of customers who buy at least two items during their shopping mall experience lies between 45% to 53%