When the null hypothesis is true and n is greater than or equal to 5 per group, the test statistic for the friedman test is approximately distributed as a

(a)t-distribution

(b)f-distribution

(c)normal distribution

(d)chi-square distribution

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?