Chi-Square Test for Population Variance | Solved Examples

This lecture explains the Chi-Square Test for Population Variance. A simple 3 step rule is defined for solving each problem.

[@bobrobert8684]

Thank you for such an excellent tutorial.

[@niranjanskulkarni]

Some times for sample variance they use n-1 in place of n. Can you explain about this?

[@bhupendrakumar2277]

It's degree of freedom. The specification could be like: for Binomial it's n-1. For Tabular data it is: (number of rows -1)*(number of columns -1). And the possible and practical reason could be that topmost and left most rows are always headers.

[@whatspp-tc3gw]

Sir chi square distribution ki condition thi ki no. Of independent observation should be>50, so variance k concept me why sample size is small

[@arunkrishna4053]

Sir it is same as chi squre distribution of variance

[@laxmimishra6012]

Thank you so much sir your class is very easy and clear to understand sir 🙏

[@DrHarishGarg]

Many thanks dear... Keep watching and sharing with others too.

[@wenhsichua9133]

what happens if the sample size n is unknown? How then do we find a particular percentile on the chi squared distribution?

[@hectormickey1]

Hi,
Thank you for your valuable explanation,
Do you have videos on how to use MATLAB for Hooke and Jeeves method, and Powell’s methods for optimization?

[@DrHarishGarg]

Still not... But upload soon

[@sonalshaju1924]

Thankyou easy to understand

[@debpratimsom3611]

Sir i think you are using capital S that is the unbiased estimator but you mistakenly wrote small s that is the biased estimator

[@Sambhai01]

Please sir provide also pdf of these lectures

[@unexpectedwe6697]

For sample variance is it n-1 or just n?

[@DrHarishGarg]

Its depends, whether biased or unbiased variance

[@debpratimsom3611]

@@DrHarishGarg sample size is less than 30 then we must use n-1 if we are using small s that is the biased estimator

[@princeakpabli7988]

Does that mean you were using the based variance?
Besides, how do you know when to use the biased or unbiased variance?

[@naira3677]

Sir please Start uploading lecture on biostatistics

[@user-bz1tk6th1i]

nS^2/sigma^2 OR (n-1)s^2/sigma^2 which formulae should use confusing,,,,Can u clarify plz.

[@vikramramkumar2087]

In the video he uses capital S => biased estimator, relation between s and S => n*S^2 = (n-1)*s^2

[@biswajitdutta762]

Sir, make some videos on ANOVA and solve some gate/Net ANOVA questions.

[@DrHarishGarg]

Already available ..

[@shrawankumarpatel2148]

🌺🌺🌺🌺🌺