Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n = 964 and x = 507 who said "yes." Use a 95% confidence level. Click the icon to view a table of z scores. . . . . . a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.)A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 548 babies were born, and 274 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, does the method appear to be effective? . . . . .