An investment website can tell what devices are used to access their site. the site managers wonder whether they should enhance the facilities for trading via smartphones so they want to estimate the proportion of users who access the site that way. they draw a random sample of 387 investors from their customers. suppose that the true proportion of smartphone users is 38%. complete parts a. through c. below.

a. what would the managers 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 samplingdistribution?