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Q3 (5 points) A study investigated physical characteristics of the ears of Caucasian Italians. In one part of the study, a sample of 66 females between the ages of 18 and 30 years old revealed a mean right ear length of 61.9mm. For the purpose of this question, assume that the population standard deviation is 4.1 mm. (a) Find the 90% confidence interval for the population mean. (b) Interpret the 90% confidence interval you found earlier. (0) Without constructing the 95% confidence interval, comment on the the a similarity and a difference between the 90% and 95% confidence interval