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Recents Q Search Favorites AirDrop Recents Screen Shot 2018-03-01 at 6.17.11 PM Open with Preview The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): 25· Critical Reading 502 Mathematics Writing 515 494 Assume that the population standard deviation on each part of the test is = 100. What is the probability a sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test? What is the probability a sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 515 on the Mathematics part of the test? Compare this probability to the value computed in part (a). What is the probability a sample of 100 test takers will provide a sample mean test score within 10 of the population mean of 494 on the writing part of the test? Comment on the differences between this probability and the values computed in parts (a) and (b). a. b. c.

Explanation / Answer

a)

b)

this is same as of part a) because distance of values in term of standard deviation is same for both parts.

c)

this is same as of part a) and b) because distance of values in term of standard deviation is same for all of three parts.

for normal distribution z score =(X-)/ here mean=       = 502.000 std deviation   == 100.0000

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