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1. Use the DDT data set which records measurements on 144 fish caught on the Tennessee river and its tributaries: 2. Plot the boxplot of

1. Use the DDT data set which records measurements on 144 fish caught on the Tennessee river and its tributaries:

2. Plot the boxplot of the DDT variable using whiskers extending as far as 3 Interquartile ranges

3. Using the boxplot() function in R find the outliers: Hint: Use the list output from the function

4. Using the boxplot method find the possible outliers: Hint: setdiff() might be useful though not absolutely necessary

5. Use the z technique to find outliers -- what are they?

6. What deficiency do you see in the use of z to find outliers?

DDT data set:

RIVER MILE SPECIES LENGTH WEIGHT DDT
FCM 5 CCATFISH 42.5 732 10
FCM 5 CCATFISH 44 795 16
FCM 5 CCATFISH 41.5 547 23
FCM 5 CCATFISH 39 465 21
FCM 5 CCATFISH 50.5 1252 50
FCM 5 CCATFISH 52 1255 150
LCM 3 CCATFISH 40.5 741 28
LCM 3 CCATFISH 48 1151 7.7
LCM 3 CCATFISH 48 1186 2
LCM 3 CCATFISH 43.5 754 19
LCM 3 CCATFISH 40.5 679 16
LCM 3 CCATFISH 47.5 985 5.4
SCM 1 CCATFISH 44.5 1133 2.6
SCM 1 CCATFISH 46 1139 3.1
SCM 1 CCATFISH 48 1186 3.5
SCM 1 CCATFISH 45 984 9.1
SCM 1 CCATFISH 43 965 7.8
SCM 1 CCATFISH 45 1084 4.1
TRM 275 CCATFISH 48 986 8.4
TRM 275 CCATFISH 45 1023 15
TRM 275 CCATFISH 49 1266 25
TRM 275 CCATFISH 50 1086 5.6
TRM 275 CCATFISH 46 1044 4.6
TRM 275 CCATFISH 52 1770 8.2
TRM 280 CCATFISH 48 1048 6.1
TRM 280 CCATFISH 51 1641 13
TRM 280 CCATFISH 48.5 1331 6
TRM 280 CCATFISH 51 1728 6.6
TRM 280 CCATFISH 44 917 5.5
TRM 280 CCATFISH 51 1398 11
TRM 280 SMBUFFALO 49 1763 4.5
TRM 280 SMBUFFALO 46 1459 4.2
TRM 280 SMBUFFALO 52 2302 3
TRM 280 SMBUFFALO 46 1614 2.3
TRM 280 SMBUFFALO 46 1444 2.5
TRM 280 SMBUFFALO 48 2006 6.8
TRM 285 CCATFISH 44 936 19
TRM 285 CCATFISH 42 1058 7.2
TRM 285 CCATFISH 42.5 800 6
TRM 285 CCATFISH 45.5 1087 10
TRM 285 CCATFISH 48 1329 12
TRM 285 CCATFISH 44 897 2.8
TRM 285 LMBASS 28.5 778 0.48
TRM 285 LMBASS 26 532 0.18
TRM 285 LMBASS 25.5 441 0.34
TRM 285 LMBASS 25 544 0.11
TRM 285 LMBASS 23 393 0.22
TRM 285 LMBASS 28 733 0.8
TRM 290 CCATFISH 41 961 8.7
TRM 290 CCATFISH 44 886 22
TRM 290 CCATFISH 41 678 13
TRM 290 CCATFISH 42 1011 3.5
TRM 290 CCATFISH 42.5 947 9.3
TRM 290 CCATFISH 44 989 21
TRM 290 SMBUFFALO 43.5 1291 3.4
TRM 290 SMBUFFALO 46.5 1186 13
TRM 290 SMBUFFALO 43 1293 5.6
TRM 290 SMBUFFALO 47 1709 12
TRM 290 SMBUFFALO 46 1425 21
TRM 290 SMBUFFALO 41 1176 8
TRM 295 CCATFISH 36 980 12
TRM 295 CCATFISH 47.5 1176 6
TRM 295 CCATFISH 41.5 989 4.7
TRM 295 CCATFISH 49.5 1084 31
TRM 295 CCATFISH 46 1115 5.2
TRM 295 CCATFISH 46.5 724 27
TRM 300 CCATFISH 36 847 18
TRM 300 CCATFISH 37 876 7.5
TRM 300 CCATFISH 35 844 3
TRM 300 CCATFISH 36 908 13
TRM 300 CCATFISH 48 1358 7.3
TRM 300 CCATFISH 49 1019 15
TRM 300 SMBUFFALO 35.5 1300 1.3
TRM 300 SMBUFFALO 46 1365 4.8
TRM 300 SMBUFFALO 45 1437 5.1
TRM 300 SMBUFFALO 44.5 1460 5.1
TRM 300 SMBUFFALO 49 1671 4
TRM 300 SMBUFFALO 47.5 1717 10
TRM 305 CCATFISH 35 613 12
TRM 305 CCATFISH 51 353 22
TRM 305 CCATFISH 42.5 909 10
TRM 305 CCATFISH 38 886 11
TRM 305 CCATFISH 41 890 17
TRM 305 CCATFISH 47 1031 9.7
TRM 310 CCATFISH 45 1083 12
TRM 310 CCATFISH 45.5 864 4.7
TRM 310 CCATFISH 45 886 6
TRM 310 CCATFISH 45 965 3.8
TRM 310 CCATFISH 39 537 17
TRM 310 CCATFISH 40.5 630 12
TRM 310 SMBUFFALO 46 1486 1.4
TRM 310 SMBUFFALO 47 1743 6.1
TRM 310 SMBUFFALO 48.5 2061 2.8
TRM 310 SMBUFFALO 48 1707 4.8
TRM 310 SMBUFFALO 38 862 5.7
TRM 310 SMBUFFALO 38.5 911 3.3
TRM 315 CCATFISH 29.5 476 3.3
TRM 315 CCATFISH 42 743 3.7
TRM 315 CCATFISH 47.5 1128 9.9
TRM 315 CCATFISH 43.5 848 6.8
TRM 315 CCATFISH 47.5 1091 13
TRM 315 CCATFISH 43.5 715 8.8
TRM 320 CCATFISH 47.5 983 57
TRM 320 CCATFISH 51.5 1251 96
TRM 320 CCATFISH 49.5 1255 360
TRM 320 CCATFISH 47 1152 130
TRM 320 CCATFISH 47.5 1085 13
TRM 320 CCATFISH 47 1118 61
TRM 320 SMBUFFALO 36 1285 12
TRM 320 SMBUFFALO 34.5 1178 33
TRM 320 SMBUFFALO 44.5 1492 48
TRM 320 SMBUFFALO 46 1524 10
TRM 320 SMBUFFALO 46 1473 44
TRM 320 SMBUFFALO 32.5 520 0.43
TRM 325 CCATFISH 46 863 1100
TRM 325 CCATFISH 40 549 9.4
TRM 325 CCATFISH 43.5 810 4.1
TRM 325 CCATFISH 46.5 908 2.8
TRM 325 CCATFISH 43 804 0.74
TRM 325 CCATFISH 47.5 1179 14
TRM 330 CCATFISH 32 556 22
TRM 330 CCATFISH 40.5 659 9.1
TRM 330 CCATFISH 51.5 1229 140
TRM 330 CCATFISH 48 1050 4.2
TRM 330 CCATFISH 47 952 12
TRM 330 CCATFISH 41 826 2
TRM 330 SMBUFFALO 33.5 599 0.3
TRM 330 SMBUFFALO 47 1704 1.2
TRM 340 CCATFISH 50 1207 7.1
TRM 340 CCATFISH 45 911 180
TRM 340 CCATFISH 49 1498 1.5
TRM 340 CCATFISH 49.5 1496 2.4
TRM 340 CCATFISH 50 1142 4.3
TRM 340 CCATFISH 45 879 3.9
TRM 340 SMBUFFALO 32.5 525 0.99
TRM 340 SMBUFFALO 38 806 0.45
TRM 340 SMBUFFALO 38.5 694 2.5
TRM 340 SMBUFFALO 36 643 0.25
TRM 345 LMBASS 26.5 514 0.58
TRM 345 LMBASS 23.5 358 2
TRM 345 LMBASS 30 856 2.2
TRM 345 LMBASS 29 793 7.4
TRM 345 LMBASS 17.5 173 0.35
TRM 345 LMBASS 36 1433 1.9

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