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In a study of academic procrastination, the authors of a paper reported that for a sample of 461 undergraduate students at a midsize public university preparing for a final exam in an introductory psychology course, the mean time spent studying for the exam was 7.34 hours and the standard deviation of study times was 3.50 hours. For purposes of this exercise, assume that it is reasonable to regard this sample as representative of students taking introductory psychology at this university. (a) Construct a 95% condence interval to estimate [4, the mean time spent studying for the nal exam for students taking introductory psychology at this university. (Round your answers to three decimal places.) ( .l l) (b) The paper also gave the following sample statistics for the percentage of study time that occurred in the 24 hours prior to the exam. n = 461 i = 43.68 s = 21.86 Construct a 90% condence interval for the mean percentage of study time that occurs in the 24 hours prior to the exam. (Round your answers to three decimal places.) ( . l )