# Answer to Question #2859 in Statistics and Probability for Dishen Patel

Question #2859

& Suppose we draw a sample of size 150 from a lot of cash registers. We test each of the sampled cash registers and find 13 defectives. <br>a) Determine a 95% confidence interval for the proportion of defectives in the entire batch, and <br>b) Determine the sample size necessary to estimate the proportion of defectives to within 2% with 95% confidence.

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