This statistics video tutorial explains how to find the Z-score, which is used to determine the confidence interval and margin of error for a population mean. This video contains two example problems in which you are asked to find a 90% and a 95% confidence interval using the population standard deviation, the sample mean, and the sample size. The margin of error is also known as the error limit. This video also explains the difference between the confidence interval and the confidence level. It also explains the meaning of the Greek symbol alpha in this context.

Introduction to statistics:
https://www.youtube.com/watch?vXZo4xyJXCak

Introduction to probability theory:
https://www.youtube.com/watch?vSkidyDQuupA

Central Limit Theorem:
https://www.youtube.com/watch?v4YLtvNeRIrg

Standard error of the mean:
https://www.youtube.com/watch?vUuHqq09nTAk

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Confidence intervals and margin of error:
https://www.youtube.com/watch?vDT-fPG0Hff8

Determine the Z-score using the confidence interval:
https://www.youtube.com/watch?vsJyZ9vRhP7o

To calculate the sample size:
https://www.youtube.com/watch?vnkkxu09K3ZA

Student's T-distribution:
https://www.youtube.com/watch?vMUD390jtgQs

Confidence interval population proportion:
https://www.youtube.com/watch?v_aQTgv_OOSU

Chebyshev’s theorem:
https://www.youtube.com/watch?vZXq0ygaZuwg

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Hypothesis testing – null and alternative hypotheses:
https://www.youtube.com/watch?vwiYJWyfdGg4

Type I and Type II errors:
https://www.youtube.com/watch?v9yQm9F2_yIk

One-sided and two-sided test:
https://www.youtube.com/watch?vXHPIEp-3yC0

Test statics for means and population proportions:
https://www.youtube.com/watch?vHag0GW9B6EY

Problems in testing hypotheses:
https://www.youtube.com/watch?vzJ8e_wAWUzE

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Final exams and video playlists:
https://www.video-tutor.net/

Full videos and worksheets:
https://www.patreon.com/MathScienceTutor/collections

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