Margin of Error
Z-Score vs T-Score Z-Score Link
Z-Score’s formula $$z = \frac{X - \mu}{\sigma}$$ where X = sample mean, $\mu$ = population means, $\sigma$ = population standard deviation.
Also, we use Z Score when sample size >= 30 or we know the population’s mean dna SD.
Z Table
T-Score T-Score T-Score’s formula $$T = \frac{X - \mu}{s/ \sqrt{n}}$$ where X = sample mean, $\mu$ = population mean, s = sample standard deviation, and n = sample size.……