For each problem, select the best response. (a) Which of these variables is leas

Question

For each problem, select the best response. (a) Which of these variables is least likely to have a Normal distribution? A. Lengths of 50 newly hatched pythons. B. Heights of 100 white pine trees in a forest. C. Income per person for 150 different countries. D. None of the above. (b) The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 266 days and standard deviation 16 days. About 95% of all pregnancies last between A. 250 and 282 days. B. 218 and 314 days. C. 260 and 320 days. D. 234 and 298 days. E. None of the above. (c) The scores of adults on an IQ test is approximately Normal with mean 100 and standard deviation 15. Corinne scores 118 on such test. Her z-score is about A. 18 B. 7.87 C. 1.2 D. 0.67 E. None of the above

Explanation / Answer

Part-a Option-A

Part-b- option-D by empiricle rule

Part-c-option-C as Z=(118-100)/15=1.2

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