Question 5 A 2020 survey of 1,250 American adults indicates that 77% of cell phone owners do their browsing on their phone rather than a computer or other device. a) Calculate a 90% confidence interval for the true proportion of Americans who access the internet on their phones, using the original sample. (i) Point estimate : (ii) 90% Margin of error : (iii) 90% Confidence Interval : b) Interpret the confidence interval in the context of the