Now suppose we take a random sample of 20 CU Boulder students and find that the sample mean for amount of time spend each week engaged in coursework is x = 31.4 hours. Let's further assume the population standard deviation is still o = 2.8 hours. 5. Construct a 90% confidence interval for the true mean time that CU Boulder students spend each week engaged in coursework. In addition to the interval estimate, your solution should include the values for za,, the standard error and the margin of error 6. Based on your confidence interval above, is it reasonable to say CU Boulder students spend more time engaged in coursework each week compared to CU Denver students? EXPLAIN. 7. Use the t-table and/or Excel to complete the table below. a Confidence Level df Za/2 ta/2 a n 90 0.10 35 95 28 98 61 99 19

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