How to Calculate Confidence Intervals

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.

[@SandrisInvestments]

Great

[@ExactRealism]

im so confused and my final is in 2 days :(

[@vongaimhungu3128]

Thanks