Answers to selected problems of Chapter 7

# Answers to selected problems of Chapter 7 - Chapter 7...

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Chapter 7 – Solutions for selected problems 7.4 a) The population distribution is the set of all x values for the population of people who suffer occasionally from migraine headaches, 60% of which are 1 (person gets some relief from taking ibuprofen) and 40% of which are 0 (no relief). P(0) = 0.40, P(1) = 0.60. b) Mean= p =0.60. c) Standard error= d) The standard error describes how much the sample proportion varies from one sample (of size 24) to the next. Since the sampling distribution is approximately normal, most of the sample proportions will fall within 3(0.10)=0.3 of the mean (0.60). 7.6 a) The interval of values within the sample proportion will almost certainly fall within three standard errors of the mean: 0.53 to 0.59. b) Based on the interval calculated in (a), it would be unusual to observe a sample proportion of 0.60. c) . Since 0.565 falls 0.63 standard deviations above the mean, it would not be unusual to observe a sample proportion of 0.565. 7.18

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## This note was uploaded on 08/04/2011 for the course MATH 2300 taught by Professor Staff during the Spring '08 term at Texas Tech.

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Answers to selected problems of Chapter 7 - Chapter 7...

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