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What is the null and alternative hypothesis for the health question: Does BMI affect survival status? (BMI can be put into categories for underweight, normal

What is the null and alternative hypothesis for the health question: Does BMI affect survival status?

(BMI can be put into categories for underweight, normal weight etc.)

Answer: H₀: X²=0 H_a:X²>0.

Is this a correct null and alternative hypothesis? If not, what is needed to correct it?

Thanks.

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