A series of free Statistics Lectures & solutions in videos.
These lectures cover the concepts of t-distribution, confidence intervals about the mean, population standard deviation, confidence intervals for population proportions and calculating required sample size to estimate population proportions.
This is page seventeen of the series of free video lessons, "Statistics Lectures".
Confidence Intervals about the Mean, Population Standard Deviation Unknown
Confidence Intervals for Population Proportions
Calculating Required Sample Size to Estimate Population Proportions
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