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Upper tail area is .005 with 31 degrees of freedom. What is t? Lower tail area is .9 with 7 degrees of freedom. What is

Upper tail area is .005 with 31 degrees of freedom. What is t?

Lower tail area is .9 with 7 degrees of freedom. What is t?

Find two t values symmetrically distributed about 0 so that 80% of the area falls between these two t values with 20 degrees of freedom. - What is the smaller t value and the bigger t value?

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