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Suppose a researcher wishes to construct a 99% ?-confidence interval for the difference of two independent...

Suppose a researcher wishes to construct a 99% ?-confidence interval for the difference of two independent means with unknown population standard deviations. His sample sizes are ?1=7 and ?2=10, and his calculated Satterthwaite approximate degrees of freedom are 12.513.

What is the positive ?‑critical value for this confidence interval, rounded to 3 decimal places?

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Answer #2

Critical value is 3.032

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