Which of the following would not be considered an example of a matched pair or paired data? O subjects testing their reaction time before taking a trial medication and after taking a trial medication O students comparing their scores on highstakes exams prior to enrolling in a class and after 4 weeks of instruction in the class O a study using two groups of adults, one aged 25-36 years and the other aged 45-56 years, to determine the amount of time dedicated to leisure activities during the week

Which of the following operations on the set Z has more than one left neutral element and no right neutral element? (a) a ° b = b - a (b) a°b = b (c) a°b = a + ab - 1 (d) a°b = ab (e) Such a prescription does not exist.

Please help to solve this. Does this question use combinatorics? Since we are told that marbles are selected at random (together, without replacement). A box has 1 red and 3 blue marbles.Two marble are selected at random (together, without replacement).Let R be the number of reds we get.Let B be the number of blues we get.Compute Cov(R, B).

Let yII + yI - 42y = 0 Find all values of k such that y = ekx