TV advertising agencies face increasing challenges in reaching audience members be- ported that 70% of 2346 American adults surveyed said they have watched digitally cause viewing TV programs via digital streaming is gaining in popularity. A poll re- streamed TV programming on some type of device. (a) Find sample mean and standard deviation. (b) Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who watched streamed programming up to that point in time. (c) What sample size would be required for the width of a 95% CI to be at most 0.10 irrespective of the value of p? (Round your answer up to the nearest integer.