Question

A sample of 26 offshore oil workers took part in a simulated escape exercise, resulting in the accompanying data on time (sec) complete the escape: 382 352 354 360 378 420 323 395 404 372 376 372 363 367 366 326 339 394 391 368 377 358 354 407 331 399 (a) Construct a stem-and-leaf display of the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) Stems Leaves 32 33 34 35 36 37 38 39 40 41 42 How does it suggest that the sample mean and median will compare? O The display is negatively skewed, so the median will be greater than the mean. The display is negatively skewed, so the mean will be greater than the median. The display is positively skewed, so the mean will be greater than the median. O The display is reasonably symmetric, so the mean and median will be close. The display is positively skewed, so the median will be greater than the mean.

Answer 1

> x <- c(382, 352, 354,360,378, 420, 323, 395, 404,372, 376, 372, 363, 367, 366,326,339, 394,391,368,377,358,354,407,331,399) > stem (x) The decimal point is 1 digit(s) to the right of the | 32 | 36 33 | 19 34 | 35 | 2448 36 | 03678 37 | 22678 38 2 39 | 1459 40 | 47 41 42 | 0

(D) The display is reasonably symmetric, so the mean and median will be close.

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