Question

A sample of 26 offshore oil workers took part in a simulated escape exercise, resulting in the accompanying data on time (sec) to complete the escape.
389 356 359 364 376 424 325 394 402 373 374 371 365 366 365 325 339 394 393 369 375 359 356 403 334 397

A normal probability plot of the n = 26 observations on escape time given above shows a substantial linear pattern; the sample mean and sample standard deviation are 371.04 and 24.42, respectively. (Round your answers to two decimal places.)

Required:
a. Calculate the upper confidence bound for a population mean escape time at 95% confidence level assuming the population distribution is normal.
b. Prior to the simulated escape exercise, the investigator believed that true average escape time is at most 360 seconds. Does the data contradict this belief at 95% confidence?

Answer 1

Answer:

Step-by-step explanation:

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