An 80% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.26, 0.41).
(a) What is the sample proportion of students with brown hair? (Round to 3 decimal places, if needed.)
(b) What is the margin of error of this interval? (Round to 3 decimal places, if needed.)
(c) What is the critical value used for this interval? (Round to 3 decimal places, if needed.)
(d) What is the standard error of the estimate? (Round to 3 decimal places, if needed.)
(e) What was the sample size? (Round to the appropriate integer.)