An 80% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.29, 0.4). (a) What is the sample proportion of students with brown hair? (Round to 3 decimal places, if needed.) H (b) What is the margin of error of this interval? (Round to 3 decimal places, if needed.) U (c) What is the critical value used for this interval? (Round to 3 decimal places, if needed.) H (d) What is the standard error of the estimate? (Round to 3 decimal places, if needed.) H (e) What was the sample size? (Round to the appropriate integer.) U