The length for 90% of all samples will be between 255.95 and 260.05 days. B. We

Question

The length for 90% of all samples will be between 255.95 and 260.05 days. B. We are 90% confident that the true average length is between 255.91 and 260.09 days. C. 90% of all samples will give a confidence interval of between 255.95 and 260.05 days. D. We are 90% confident that the true average length is between 255.95 and 260.05 days. The length (days) of one pregnancy represents: A. Data B. A parameter C. A variable D. A statistic The amount of time between pauses on a computer terminal is uniformly distributed between 0.2 and 0.8 seconds. Find the probability that the amount of time between pauses will exceed 0.68 seconds. A. 0.80 B. 0.12 C. 0.88 D. 0.2 Find the minimum amount of time the longest 83% of pauses last. A. 0.302 seconds B. 0.498 seconds C. 0.136 seconds D. 0.370 seconds

Explanation / Answer

22 - Data

23- This is a uniform distribution with A = 0.2 & B = 0.8

Answer is (0.8-0.68)/(0.8-0.2) = 0.12/.60 = 0.2 Answer

24 - Answer can be found as

0.83= [0.8-x]/[0.8-0.2]

or x = 0.8 - 0.83*0.6 = 0.302

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