Sampling_Distribution_(continued)

# Find the sample size needed to estimate the

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Unformatted text preview: needed to be 99% conﬁdent Sampling Distribution of the Sample Proportion (continued Checkpoint 3 - Modeling and Inference Sampling Distribution of the Sample Proportion Example 5. Find the sample size needed to estimate the proportion of believers within 3% with a conﬁdence level of 98%. 6. Suppose we want to cut the margin of error to 1%. What is the necessary sample size? Sampling Distribution of the Sample Proportion (continued Checkpoint 3 - Modeling and Inference Sampling Distribution of the Sample Proportion Example 2 (for Sample Proportion) Suppose of all voters in the U.S., 40% are in favor of Candidate Y for president. Gallup poll takes a sample of 2400 people. 1 What proportion of sample would be expected to vote for Candidate Y? 2 What does CLT for the proportion tell us about the mean and SD for the proportion of people who vote for Cand Y? Use p (1 − p ) ˆ p ∼ Normal p , n Sampling Distribution of the Sample Proportion (continued Checkpoint 3 - Modeling and Inference Sampling Dis...
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## This note was uploaded on 03/12/2014 for the course STATS 10 taught by Professor Ioudina during the Spring '08 term at UCLA.

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