Lab2Sols - STAT 350 Lab 2 Solutions(30 points STUDENTS HAVE...

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Unformatted text preview: STAT 350 Lab 2 Solutions (30 points) STUDENTS HAVE TO WRITE DOWN NAME, Sec # OR CLASS TIME, AND LAB #, THEY SHOULD LABEL EACH PART WITH THE PROBLEM NUMBER AND PUT THEM IN LOGICAL ORDER. CUT OFF 1POINT FOR NOT DOING SO. Problem 1 (5) Obs mile group km 1 1280 3 2059.96 2 5320 3 8561.73 3 4390 3 7065.03 4 2100 3 3379.63 5 1240 3 1995.59 6 3060 3 4924.60 7 4770 3 7676.59 8 1050 3 1689.81 9 360 3 579.36 10 3330 3 5359.13 11 3380 3 5439.59 12 340 3 547.18 13 1000 3 1609.35 14 960 3 1544.97 15 1320 3 2124.34 16 530 3 852.95 17 3350 3 5391.31 18 540 3 869.05 19 3870 3 6228.17 20 1250 3 2011.68 21 2400 3 3862.43 22 960 3 1544.97 23 1120 3 1802.47 24 2120 3 3411.82 25 450 3 724.21 26 2250 3 3621.03 27 2320 3 3733.69 28 2400 3 3862.43 29 3150 3 5069.44 30 5700 3 9173.28 31 5220 3 8400.79 32 500 3 804.67 33 1850 3 2977.29 34 2460 3 3958.99 35 5850 3 9414.68 36 2700 3 4345.24 37 2730 3 4393.52 38 1670 3 2687.61 39 100 3 160.93 40 5770 3 9285.93 41 3150 3 5069.44 42 1890 3 3041.67 43 510 3 820.77 44 240 3 386.24 45 396 3 637.30 46 1419 3 2283.66 47 2109 3 3394.11 Problem 2. (5) 6000 4000 miles 2000 0 3 group 10000 7500 km 5000 2500 0 3 group Problem 3 (5) 36 34 32 s c o r e 30 28 26 1 2 gr oup 3 Group 1 is symmetrical, has a lower center than the other two groups. Group 2 is slightly negatively skewed, Group 3 is positively skewed. Groups 2 and 3 have very similar centers. All three have similar variances. Problem 4. (10) Group 1 Group 2 Group 3 Mean 29.49 Std Deviation 1.96324561 Mean 31.31 Std Deviation 2.1424026 Mean 31.4 Std Deviation 1.96751394 They should claim group 1 is very close to normal distribution. For group 2 or 3, either "normal" or "non-normal" is fine if they give reasonable arguments. gr oup=1 33 32 31 30 s c o r e 29 28 27 26 - 2 - 1. 5 - 1 - 0. 5 0 Nor m Quant i l es al 0. 5 1 1. 5 2 Group 1 above looks normal. gr oup=2 35 34 33 32 s c o r e 31 30 29 28 - 2 - 1. 5 - 1 - 0. 5 0 Nor m Quant i l es al 0. 5 1 1. 5 2 Group 2 above isn't perfectly normal but it's pretty good. We'd definitely say normality is ok. gr oup=3 34 33 32 31 s c o r e 30 29 28 27 - 2 - 1. 5 - 1 - 0. 5 0 Nor m Quant i l es al 0. 5 1 1. 5 2 Group 3 above is definitely the "least normal" of the 3, but still it would be considered roughly normal. Problem 5. (5) 36 34 32 s c o r e 30 28 26 - 3 - 2 - 1 0 Nor m Quant i l es al 1 2 3 Collectively all the 3 groups together are quite normal as we see a very nice straight-line (roughly) on the QQPlot. ...
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This note was uploaded on 02/06/2012 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue.

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