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How to Calculate Confidence Intervals
ChannelArnold TutoringDescription from the creator
This video describes how to calculate a 95% confidence interval for the population mean.
Remember that we don't know the population mean, so we start with the best guess - the sample mean, and we build around that with a +/- margin of error.
In this example, we don't know the population standard deviation, so we would normally use a t score. However, because the sample size is so high, the Central Limit Theorem kicks in and it's appropriate to use a z-value alongside the standard error.
Note: It's helpful to memorize z = 1.96 for a 95% confidence interval as that's the most common interval used.
Remember that we don't know the population mean, so we start with the best guess - the sample mean, and we build around that with a +/- margin of error.
In this example, we don't know the population standard deviation, so we would normally use a t score. However, because the sample size is so high, the Central Limit Theorem kicks in and it's appropriate to use a z-value alongside the standard error.
Note: It's helpful to memorize z = 1.96 for a 95% confidence interval as that's the most common interval used.
About this tutorial
Arnold Tutoring published this 5:44 video tutorial on November 10, 2018. It has been watched 3,506 times on YouTube.
- Channel
- Arnold Tutoring
- Category
- Education
- Duration
- 5:44
- Published
- November 10, 2018
- Views
- 3,506
- Likes
- 13
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