| public static zScore ( number $M, number $μ, number $σ, boolean $table_value = false ) : float | ||
| $M | number | Sample mean |
| $μ | number | Population mean |
| $σ | number | Population standard deviation |
| $table_value | boolean | Whether to return a rouned z score for looking up in a standard normal table, or the raw z score value |
| Результат | float | |
public static function zScore($M, $μ, $σ, bool $table_value = false) : float
{
$z = ($M - $μ) / $σ;
return $table_value ? round($z, 2) : $z;
}