Next 2 questions are based on the following data. The following is a simple random sample of textbook expenses of IUPUI students for the Spring 2015 semester. 370 370 330 500 400 220 340 200 240 400 500 390 420 490 400 270 350 300 340 430 340 280 280 200 280 270 440 200 390 340 440 430 430 330 270 500 400 330 420 210 350 210 6 A 95% condence interval for the mean textbook expenditure is $ $ (Note: Use the Excel functions to compute the mean and standard deviation. Otherwise, you'd be wasting your time.) a $333 $338 b $320 $3 75 C $307 $363 d $301 $3 56 '7 In the previous question, to obtain a margin of error MOE = $10, the minimum sample size is n = Use the standard deviation from that sample (rounded to the nearest integer) as the planning value. a 368 b 298 e 207 d 152