Can someone please tell me the formula to answer 1B!!! What do I do? And a please

size. Specify a confidence level. fled contiden Calculate the interval. STHEMMOS orgin at er In a com EXERCISES SECTION 13.1 1. Website An investment company is planning to upgrade the mobile access to their website, but they'd like to know the pro- portion of their customers who access it from their smartphones. They draw a random sample of 200 from customers who re- cently logged in and check their IP address. Suppose that the true proportion of smartphone users is 36%. a) What would you expect the shape of the sampling distribution for the sample proportion to be? b) What would be the mean of this sampling distribution? c) What would be the standard deviation of the sampling distribution? 2. Marketing The proportion of adult women in the United States is approximately 51%. A marketing survey telephones 400 peo- ple at random. be women? a) What proportion of the sample of 400 would you expect to b) What would the standard deviation of the sampling distribution be? c) How many women, on average, would you expect to find in a sample of that size