Lesson 6.pdf

# Lesson 6.pdf - Lesson 6 Confidence Intervals for...

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Lesson 6: Confidence Intervals for Proportions Confidence Interval for One Proportion ( ࠵? ) We talked about how to use confidence intervals to draw conclusions about population means. Now we are interested in estimating a population proportion. Recall : For the one sample mean CI, ࠵? was the parameter. For the two sample mean CI, ࠵? ! and ࠵? ! were the parameters. Now we use p to label the parameter. In other words p is the true or the population proportion that we are interested in estimating. For example, proportion of defective items manufactured in a certain factory. P -True proportion of defective items manufactured in the factory Response is a classification : Defectives Vs non-defectives or successes Vs failures, etc. Recall :

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Confidence Interval Formula for p Ø Suppose we randomly sample 1000 items manufactured in that factory and count the number of defectives in the sample. Say there were 300 defectives.
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