(4 pts) 3. A survey of 49 individuals found that the average number of times a person blinks his or her eyes is 25 times per minute. Assume o = 4. a. Based on this survey, find the 90% confidence of the population mean number of eye blinks per minute. Round your answer to two decimal places. b. Did you construct a z-interval or a t-interval? c. Write a sentence specifically stating what this 90% confidence interval represents