Sampling_Distribution_(continued)

55z2 2 h2 sampling distribution of the sample

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Unformatted text preview: n Sample size: n= ˆ ˆ ∗/ p (1 − p )zα2 2 ME 2 ˆ Most conservative sample size (if p is unknown) n= ∗ (.5)(.5)zα2 2 / h2 Sampling Distribution of the Sample Proportion (continued Checkpoint 3 - Modeling and Inference Sampling Distribution of the Sample Proportion Example A poll of 120 adults found that 38% of the sample said that they believe in the existence of life after death. 1. Find the margin or error for this poll if we want 95% confidence in our estimate of the percent of adults who believe in life after death. 2. Explain what the ME means. 3. If we want a 99% confident, will the margin of error be larger or smaller? 4. Find the ME needed to be 99% confident 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 Proportio...
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