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1 intervals for a population proportion and the

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Unformatted text preview: ber of successes in the sample is often given, in which case, the formulas are unnecessary. © 2011 THE CARNEGIE FOUNDATION FOR THE ADVANCEMENT OF TEACHING A PATHWAY THROUGH STATISTICS, VERSION 1.6, STATWAY™  ­ STUDENT HANDOUT STATWAY STUDENT HANDOUT | 2 Lesson 8.1.1 Intervals for a Population Proportion and the Normal Distribution For the remainder of problems in this lesson, we will find confidence intervals based solely on sample statistics. TRY THESE A science fiction website claims that the proportion of college students who believe that extra ­terrestrials have visited earth is equal to 0.06. Suppose you wish to investigate this claim by doing your own study of a randomly selected sample of college students. You find that in a random sample of 250 college students, 45 believe that extra ­terrestrials have visited earth. 1 Find the sample proportion. ! = 2 Are the criteria for approximate normality sat...
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