Inferential Statistics (Leaving Cert Mathematics): Flashcards

Average value of a characteristic in entire population

$\mu$

$\bar{x}$

$\mu = \frac{\sum x}{N}$

Total number of data points in the population

$\bar{x} = \frac{\sum x}{n}$

Number of data points in the sample

When impractical to measure entire population

Range in which the population mean likely falls

$\bar{x} \pm z \times \frac{s}{\sqrt{n}}$

Z-score for desired confidence level

Sample standard deviation

1.96