River Station Length Weight Mercury Data Table 1 1 47 1616 1.6 1 1 48.7 1862 1.5 1 1 55.7 2855 1.7 1 1 45.2 1199 0.73 1 1 43.8 1225 0.51 1 1 38.5 870 0.48 1 1 45.8 1455 0.95 1 1 44 1220 1.4 1 2 47.7 3378 0.8 1 2 45.1 2920 0.34 1 2 43.5 2674 0.54 1 2 41 1904 0.9 1 2 33.7 1080 0.48 1 2 33.5 1146 0.57 1 2 32 894 0.61 1 2 29.5 754 0.38 1 2 34.9 1174 0.61 1 2 47.1 1435 1.5 1 2 44.2 1378 0.72 1 2 41 1059 1.8 1 2 41.6 873 1.6 1 2 39 857 0.98 1 2 38 743 0.88 1 2 36.1 622 1.5 1 2 33.4 503 0.73 1 3 32.8 406 1.2 1 3 31.4 362 1.1 1 3 33.6 360 1.6 1 3 29.5 313 0.87 1 3 30.5 314 0.9 1 3 30 336 0.61 1 3 33.5 448 0.99 1 3 31 263 0.2 1 3 65 4511 2.1 1 4 36 600 1.5 1 4 44 1132 0.2 1 4 40 898 1.2 1 4 44.5 1301 1.6 1 4 50.5 2021 1.2 1 4 50 1883 1.2 1 4 47 1546 1.2 1 5 26 234 0.28 1 5 30 323 0.51 1 5 30 430 0.27 1 5 29 353 0.35 1 5 31 402 0.57 1 5 41 1042 0.66 1 5 36.5 723 0.49 1 5 38 709 0.51 1 5 44 1455 0.73 1 5 39 879 1.4 1 5 48 1396 2.7 1 5 51.5 2369 0.8

1 5 56 3421 3.1 1 6 30.5 400 0.5 1 6 34 678 0.55 1 6 44.5 1853 2.7 2 7 35 620 0.73 2 8 30.4 320 0.51 2 8 36 574 1.6 2 8 34.7 491 0.58 2 8 31.7 407 0.5 2 8 34.5 496 0.58 2 8 40.1 805 1.4 2 9 33 518 0.55 2 9 40.5 970 0.84 2 9 37 673 0.76 2 9 35.5 550 0.65 2 9 40 856 1.1 2 9 35 487 1 2 9 39.5 923 1.2 2 9 31.5 521 0.74 2 9 30 348 0.41 2 9 33 440 0.78 2 9 47 586 1.3 2 9 54 2664 1.8 2 11 34.8 491 0.57 2 11 34.5 560 0.69 2 11 38.5 870 1.8 2 11 40 864 0.93 2 11 46.4 1285 0.1 2 12 41.9 1188 2.4 2 12 46.2 1365 0.88 2 12 47.3 1632 1.5 2 12 47.1 1725 1.8 2 12 56.5 2451 2.1 2 12 46.1 1327 0.91 2 12 28.5 303 0.61 2 12 36.5 566 0.1 2 12 46 1342 2.2 2 12 36.7 647 2.4 2 12 39 844 0.69 2 12 53 3026 2.7 2 12 36.5 656 0.65 2 12 41.5 1018 0.83 2 12 36.2 708 1.3 2 13 27.3 250 0.28 2 13 26.7 252 0.21 2 13 27.5 283 0.14 2 13 33.9 465 0.39 2 13 29.6 329 0.9 2 13 57.5 2401 1.4 2 13 49 1891 0.58 2 13 34.9 498 0.42 2 13 29 307 0.11 2 13 31.5 376 0.28 2 12 38.2 573 0.59

2 14 28.6 338 1.1 2 14 36.8 714 1.6 2 14 43.4 1251 1.3 2 15 50.8 2131 1.8 2 15 46.8 1604 1.8 2 15 40.2 1090 1.2 2 15 58.7 3315 2.9 2 15 56.1 2629 3.4 2 15 48 1743 1.9 2 15 44.7 1454 2.4 2 15 43.6 1245 1.8 2 15 37.6 937 2.4 2 15 40 869 1.4 2 15 46.5 772 1.7 2 15 36 724 1.3 2 16 50.4 1744 0.93 2 16 59.2 3524 3.6 2 16 49.5 1924 2.3 2 16 47.5 1546 1.4 2 16 54.2 3164 2.1 2 16 41.7 1255 1.4 2 16 36 702 0.92

Part |. Exploratory Data Analysis Let's start by doing some exploratory analysis of this dataset. The le contains informa'on on mercury concentrations in river sh. Many rivers contain small amounts of mercury, which is toxic in larger doses to most forms of life. Because mercury cannot be excreted from the body, it builds up in the tissues of animals. Directly measuring the mercury concentration in the water is impossible because it is typically below detectable limits. However, it accumulates in sh over their lifetimes, and so it can be measured in sh, which both serves as a proxy for the amount of mercury in the water, as well as measure of the danger to humans for eating sh from that river. This dataset involves sh caught at 16 stations on two rivers in North Carolina. The rivers are labeled 1 for the Lumber River and 2 for the Wacamaw River. The staons are labeled 1 through 16 (with 1 through 7 on the Lumber and 8 through 16 on the Wacamaw). For each sh caught, the length (in centimeters), weight (in grams), and mercury concentration (in parts per million) were measured. Question 8 1 pts What is the observed standard deviation of mercury (round answers to THREE decimal places)?For each of the five variables, state whether they are continuous or discrete (if quantitative) or nominal or ordinal (if qualitative). Note: If JMP did not guess the type of a variable correctly, fix it in the middle left panel (click on the icon to the left of the variable name). * * * Remember, blanks are to be filled with ONE of the following options: continuous, discrete, ordinal, nominal. SPELLING counts, DO NOT use ANY capital letters. River is a(n) variable Station is a(n) variable Weight is a(n) variable Mercury is a(n) variable Length is a(n) variableD Question 6 1 pts Describe the shape of the distribution of mercury. O Approximately normal with no outliers O Skewed right with several outliers O Skewed left with several outliers Approximately normal with several outliers