week4 - 1 The amount of time required for a job trainee to...

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1 Statistics 511 Relevant sections: 4.11, 4.12 (Note 4.11 reviews material we have already covered.) (4.12) Sampling Distributions and the Central Limit Theorem Sampling Distributions CLT for Y : More on standard deviation of the sampling distribution of Y : Notes
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2 Ex. The registrar of a large university found that the average age of undergraduate students is 20.9 with a standard deviation of 2.9. Assume that we randomly select 100 undergraduate students. What is the probability that the average age of these 100 students is less than 20 years?
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3 Normal Distribution and Sampling Distributions
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Unformatted text preview: 1. The amount of time required for a job trainee to complete a manual dexterity test is normally distributed with a mean of 13 minutes and standard deviation of 3 minutes. a. What percent of trainees take more than 15 minutes to complete the test? b. What percent of the trainees take less than 12 minutes to complete the test? 2. Refer to the problem above. Now, suppose that we randomly select 10 trainees and calculate their average test time. a. What is the probability that the average is over 15 minutes? b. What is the probability that the average is less than 12 minutes?...
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This note was uploaded on 04/28/2008 for the course ST 511 taught by Professor Prof.kimweems during the Spring '08 term at N.C. State.

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week4 - 1 The amount of time required for a job trainee to...

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