Question

Question (A)

If one wants to test whether there is difference in mean scores before and after an test, they should use two sample independent t-test since the scores before and after the test are independent

So Asnwer is Option D

Question (B)

The probability density function of uniform disitrbution is f(x) = 1 / (b - a)

So shape of the density function will be straight horizontal line between a and b

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