The following is a random sample of n = 81 undergraduate students\' annual textb

Question

The following is a random sample of n = 81 undergraduate students' annual textbook expense. 360 750 690 970 740 440 770 480 540 490 420 380 330 720 760 860 430 600 780 440 670 850 410 380 670 960 520 980 920 320 460 400 360 410 360 420 320 720 690 590 700 720 730 960 520 480 980 600 950 750 490 770 560 730 450 360 460 450 440 710 540 880 410 570 650 500 880 580 500 340 590 810 900 470 930 600 810 560 400 990 820 5 The lower and upper ends of the 95% confidence interval are: 572.15 567.85 562.25 556.65 659.95 664.25 669.85 675.45 6 In the previouse question, using a planning value of $200, to obtain a margin of error of +$20 325 342 364 385 7 In interval estimation of a population parameter, increasing the sample size would a reduce the margin of sampling error, increasing the confidence level. b reduce the margin of sampling error, diminishing the error probability c reduce the margin of sampling error, making the interval estimate more precise. d increase the margin of sampling error, making the interval estimate more precise.

Explanation / Answer

5)

option A is correct

6)

option D is correct for sample size

7)

optionC is correct

sample mean xbar= 616.05 sample size                n= 81 sample std deviation s= 198.54 standard errror of mean = sx=s/n= 22.0600

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