Sampling_Distribution_(continued)

# 55z2 2 h2 sampling distribution of the sample

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online