3RelativeResourceManager

# 3RelativeResourceManager - Part III Review for Test 2 1. It...

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Part III Review for Test 2 1. It is known that scores on the Stanford-Binet IQ test are normally distributed with a = 100 and a = 16. A sample of 15 had a mean of 102.3. All three conditions are met . a. Construct a 90 % confidence interval about the mean. Interpret your answer. Assuming we do not know that the population mean is 100, 16 102 (1.645* ) 102 6.8 15 Or (95.2 , 108.8) b. Construct a 95% confidence interval about the mean. Interpret your answer. 16 102 (1.96* ) 102 8.1 15 Or (93.9 , 110.1) c. Construct a 99% confidence interval about the mean. Interpret your answer. 16 102 (2.575* ) 102 10.6 15 Or (91.4 , 112.6) d. If we want a margin of error no larger than 5, what sample size would I need if I wanted a 95% confidence level. 2 2 2 arg 1.96 16 5 39.338 40 z n m in error n n o n f

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2. We want to estimate the speed of cars on the highway outside a subdivision where = 7mph. We randomly selected 12 cars and calculated the mean to be 59.62. Construct a 95% Confidence interval. Cannot do, Normality has not been established. 3. The scores on the Stanford-Binet IQ test are normally distributed with a = 100 and a = 16. A researcher believes the mean has increased from 100. A sample of 15 had a mean of 103.3.
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## This note was uploaded on 04/02/2011 for the course STAT 250 taught by Professor Sims during the Spring '08 term at George Mason.

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3RelativeResourceManager - Part III Review for Test 2 1. It...

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