AP Stats Confidence interval formula
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Last updated 12:29 AM on 1/28/26
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9 Terms
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Confidence interval for population mean
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90% confidence z score
1.645
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95% confidence z score
1.96
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99% confidence z-score
2.58
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t-score
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N when given a margin of error for Population Mean
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= Square root of (pie)(1-pie)/n
standard deviation of a population proportion
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Confidence interval for a population (Can calculator)
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π(1-π)(Z/B)²
N using margin of error equation for population proportion.
Note 
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