The pivot table below is a summary of data that contains market research information of 2000 customers who shop at a local drug store. The store is interested in the customers buying preferences of toothpaste. Assume that this data represents the population, calculate the below using the data set. A. What is the population mean and standard deviation for the proportion of customers who use Crest toothpaste? B. Using the data, select the first 200 customers as sampling data. Of these 200 samples, compute a point estimate and standard error of the portion of customers who prefer crest toothpaste C. Using the sample data in part b, of these 200 samples, what is the 95% confidence intervals for this sample proportion data?