Determine the number of observations, with 95% confidence, such that the true proportion of personal and unavoidable delay is with

Determine the number of observations, with 95% confidence, such that the true proportion of personal and unavoidable delay is within 6 to 10%. Given that the proportion of personal and unavoidable delay is expected to be 8%. Determine the number of observations for the same problem such that the true proportion of personal and unavoidable delay is less than 10%. Which one among the two would require higher number of observations and why? Incase, they are equal, explain the reason. What would be the mean, UCL and LCL of a p-chart for the first problem