8 QUESTIONS 5-11 ARE RELATED TO THE FOLLOWING 9 Now consider the textbook expense of of! IUFUI students. The mean and variance of textbook I0 expense ofall IUPUI students are as follows: I1 11 = $469.48 I2 0'3 2 11215.19 I3 I4 From the population of IUPUI students you take repeated samples of size I5 11 = 50 I5 and compute the sample mean textbook expense. I? 6 The standard error of the x is I8 a 13.928 I9 b 14.92? .0 c 16.104 .1 d 12.315 .2 .3 2 The fraction of sample means below 5450 is .4 a 0.0408 .5 b 0.0544 .6 c 0.0225 .2 d 0.096? .8 .9 8 The fraction of sample means that fall within 1 $20 from the population mean is :0 a 0.2859 :1 b 0.8019 :2 c 0.8183 :3 d 0.8350 :4 :5 9 The margin of error for the middle interval which captures 95% of the means from :6 samples of size 11 = 50 is. l? a 33.98 :8 b 32.36 :9 c 30.82 :0 d 29.35 :1 i2 10 The middle interval that captures 95% of the means from sample of size 11 = 50 is. :3 a 432.28 501.18 :4 b 440.12 498.83 :5 c 442.30 495.55 :5 d 444.31 494.64 :2 :8 11 To obtain a margin of error of 1310 for the interval that captures 95% of the sample i9 111 eans, the minium sample siz e is .-0 a 425 .-'l b 452 .-2 c 431 .-3 d 410 A