Unformatted text preview: d the mean and standard deviation. Sampling Distribution of the Sample Proportion (continued Checkpoint 3  Modeling and Inference
Sampling Distribution of the Sample Proportion Begin by Checking the conditions The drivers were randomly selected.
Successes: 48 ≥ 10, Failures: 152 ≥ 10
Population Size (# American Drivers) is very large.
Conclusion: The Distribution is approximately normal.
The expected value for the sample proportion is µ (ˆ) =
p
48/200 = 0.24
The standard error is σ (ˆ) = 0.24 ∗ 0.76/200 ≈ .03
p Sampling Distribution of the Sample Proportion (continued Checkpoint 3  Modeling and Inference
Sampling Distribution of the Sample Proportion Visualizing the CLT  The Bell Curve Sampling Distribution of the Sample Proportion (continued Checkpoint 3  Modeling and Inference
Sampling Distribution of the Sample Proportion Conﬁdence Intervals Recall
ˆ
The Conﬁdence Interval for p is: zα /2 = standardized zscore with an area α /2 above it. http://onlinestatbook.com/stat_sim/conf_...
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 Spring '08
 Ioudina
 Normal Distribution, Standard Deviation, Modeling and Inference

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