Exercise 46 in Chapter 1 gave n = 26 observations on escape time (sec) for oil workers in a simulated exercise, from which the sample mean and sample standard deviation are 370.69 and 24.36, respectively. Suppose the investigators had believed a priori that true average escape time would be at most 6 min. Does the data contradict this prior belief? Assuming normality, test the appropriate hypotheses using a significance level of .05.

Data From Chapter 1 Exercise 46

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A sample of 26 offshore oil workers took part in a simulated escape exercise, result- ing in the accompanying data on time (sec) to complete the escape ("Oxygen Consumption and Ventilation During Escape from an Offshore Platform." Ergo- nomics 1997: 281-292): 389 356 359 363 375 424 373 373 370 364 366 364 392 369 374 359 356 403 334 397 325 394 402 325 339 393