Khan Academy
Khan Academy: Confidence Interval Example
Sal calculates a 99% confidence interval for the proportion of teachers who felt computers are an essential tool.
Khan Academy
Khan Academy: Conditions for Valid Confidence Intervals
Conditions for valid confidence intervals.
Khan Academy
Khan Academy: Conditions for Confidence Intervals Worked Examples
Conditions for confidence intervals worked examples--random condition, independence condition and normal condition.
Khan Academy
Khan Academy: Simulation Showing Value of T Statistic
See why we use t statistics when building confidence intervals for a mean using the sample standard deviation in place of the population standard deviation.
Khan Academy
Khan Academy: Sample Size for a Given Margin of Error for a Mean
Calculate the approximate sample size required to obtain a desired margin of error in a confidence interval for a mean.
Khan Academy
Khan Academy: Example Finding Critical T Value
Example showing how to find a critical t value, and a discussion of degrees of freedom.
Khan Academy
Khan Academy: Confidence Interval for a Mean With Paired Data
Confidence interval for a mean difference with paired data.
Khan Academy
Khan Academy: Conditions for Valid T Intervals
Examples showing how to determine if the conditions have been met for making a t interval to estimate a mean.
Khan Academy
Khan Academy: Clarification of Confidence Interval of Difference of Means
Clarification of Confidence Interval of Difference of Means.
Khan Academy
Khan Academy: Confidence Interval of Difference of Means
Sal uses a confidence interval to help figure out if a low-fat diet helps obese people lose weight.