good afternoon :) can somebody help to explain why the answer is B please? than

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junior college 2 H2 Maths Singapore

good afternoon :) can somebody help to explain why the answer is B please? thank you so muchhh

Date Posted: 1 year ago

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Ellardorado

1 year ago

The pooled variance is the weighted average of the variances from the two groups. In numbers, this would be ((14)×(270)^2+(18)×(240)^2)/(32), which turns out to be B.

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Not sure if you have this formula in your data sheet. If so you can watch this video to better understand it

https://www.youtube.com/watch?v=gPQ9D8v0bM0

Date Posted: 1 year ago

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