Chi-squared test - Post 16 Biology (A Level, Pre-U, IB, AP Bio)

I have just worked through this and realised there is an error in one of the calculations which has a knock on effect through the equation so I need to update this. I will do that soon. However, the theory is still correct here.

[NuclearCashew]

The editing and the way you explained everything made this all the more easier to learn from. Thank you very much!

[alikazi]

The editing and the way you explained everything made this all the more easier to learn from.

[cyclqal]

OMG I was so utterly confused for so long and this tutorial was relaxing, easy-paced, and actually enjoyable. This explained it and the chi-square is making sense now. Thank you!

[serhanummar]

3 squared is 9, not 6. I was confused why I'm getting different chi-squared value until I review the table. :-)

[zunix]

After watching couple of videos on this topic, you turn out to be the life saver finally. Many many thanks🙏

[jevjev]

Thank you! I finally understand this. And don't worry the minor discrepancies did not take away from lesson.

[skuasomething]

if anyone else noticed that their answer was different then his its because. in the example he said 3 squared was 6 (which should equal 9) also the observed amount of green wrinkled goes from 37 -> 38 (it should be 37) therefore O-E should = 2 and O-E^2 should = 4. Both of these result in his answer being wrong. (x^2) should be = 1.764 not 1.821
you would still accept the null in the end regardless. And overall this video was very helpful but I just wanted to clarify incase anyone else noticed that their answer was different then his and wasn't sure why :)

[abdullahhussain]

Something clear and worth watching. Thank yoooouuuu

[forrdera]

the only helpful chi square video out there, keep it up

[eviemannakee]

Omg this makes so much more sense thank you :)

[ao_mine]

Hi. How do we find the expected values from the observed values? I am stuck at this point.

[aceayade]

thank you for this! such an amazing video

[SrApolloHG]

Thank you! Loved this I understand it perfectly now

[natashaaini]

why is 1.821 between 1 and 1.42? shouldn't be between 1.42 and 2.73?

[edwardjosephdzongololo]

thank you so much i was having problems to understand this now its crear

[theodoresweger]

Beautifully done, I gota slightly different Chi sq, your numbers changes from 37 to 38 between 2:59 and 3:61.

[simranmehta]

was really good, but you said that 3 squared was 6

[La..la..]

Excuse me, where is the ration for the expected coming from?

[mdaniels]

What situations would lead to the null hypothesis being wrong, from a genetic POV? What went wrong?

[sonitclef]

3:29. Is the observed for green wrinkled supposed to be 37? Because when u add the observed up it equals 561. Idk 😐