1
$\begingroup$

Could someone please clarify why in Chi-squared and F-statistic calculation formulas sample variances are used as $s^2$ and not $s^2/n$ (like in Z or t tests)?

$\chi^2 = \frac{(n-1)s^2}{\sigma^2} $

$F = \frac{s^2_1}{s^2_2}$

$\endgroup$
  • 1
    $\begingroup$ Which formulas specifically are you asking about? Statistics with these distributions appear in many contexts and have many different formulas. $\endgroup$ – whuber Dec 1 '15 at 22:07
  • $\begingroup$ I edited the post, it should be clearer now. $\endgroup$ – vaidqs Dec 1 '15 at 22:22

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.