Confidence Intervals for One Mean:  Finding the Appropriate Z Value @jbstatistics
Confidence Intervals for One Mean:  Finding the Appropriate Z Value  @jbstatistics
Uploaded February 2012 | Updated September 2026, 2 hours ago
I have an updated and revised version of this video available at youtu.be/grodoLzThy4. Please watch the improved version.

Finding the appropriate z value when calculating a confidence interval, using both standard normal tables and the free computer program R. I work through 2 examples.
Confidence Intervals for One Mean:  Finding the Appropriate Z ValueFinding Percentiles and Areas for the F Distribution Using RP(A) = P(A and B) + P(A and Bc)Introduction to the Central Limit TheoremHypothesis Tests for One Population VariancePooled-Variance t Tests and Confidence Intervals: An ExampleIntroduction to One-Way ANOVADeriving the Mean and Variance of a Continuous Probability DistributionUsing R to Find Chi-square Areas and PercentilesAn Introduction to the t Distribution (Includes some mathematical details)t Tests for One Mean: IntroductionSimple Linear Regression: Inference on the Slope (An Example) (Old, fast version)
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Confidence Intervals for One Mean: Finding the Appropriate Z Value

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