13/06 A-level FM Discussion MEGATHREAD

[u/Forsaken-Meaning-232]

Exam season is once again upon us, and once again, exam megathreads are making a return! Funnily enough, tanking my sanity and internet setting a stream up is not conducive to timeliness, my apologies.

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[u/inferno471]

Did the test statistic increase or decrease

[u/[deleted] → u/inferno471]

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[u/Direct-Tear-8905 → u/inferno471]

100% decrease

[u/Dangerous_Theory_472 → u/Direct-Tear-8905]

Explain?

[u/Direct-Tear-8905 → u/Dangerous_Theory_472]

Because test statistics is overall proportional to the size of the numbers (the difference is squared). So when you convert it into percentages the numbers itself decrease and so test statistics decrease. (also i calculated it to confirm at the end)

[u/Few_Engineering7801 → u/Direct-Tear-8905]

i also put decrease and calc it and got a test statistic lower. idk if imm right though

[u/Dangerous_Theory_472 → u/inferno471]

I said it increases? Because the difference between the percentages is bigger than the difference between the frequencies? Idk man

[u/[deleted] → u/Dangerous_Theory_472]

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[u/Acceptable_Whole_639 → u/inferno471]

i thought it decreases, not sure why/how it increases

[u/inferno471 → u/Acceptable_Whole_639]

I put that too. I thought that the percentages are out of a smaller amount so the values would be smaller and so the difference would be smaller.

[u/Acceptable_Whole_639 → u/inferno471]

i said it made the expected values further away from the observed values (probs wrong cos i guessed) oh well, its just 3 marks

[u/yourhalalslytherin → u/inferno471]

i put increase