Explains point estimate, confidence level conclusion, and calculating a new confidence interval with 75% confidence in proportion estimates.
Point estimate: The point estimate for the proportion of adults believing in extraterrestrial life is 78%. The error bound at a 95% confidence level would be calculated using the formula: error bound = critical value * standard error.
Conclusion on belief proportion: With 95% confidence, we can infer that the proportion of American adults believing in extraterrestrial life is between the confidence interval ranges.
75% confidence interval: Using the provided point estimate (78%) and n = 1,000, you can calculate another confidence interval. However, reaching a conclusion about the belief proportion would require statistical testing at the new confidence level.
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