Need explanation on why this is the answer 2. VICE OR VERSA An exercise physiolo

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Need explanation on why this is the answer

2. VICE OR VERSA An exercise physiologist conducts an experiment to determine the effects of two strength training exercises (bench press and parallel bar dips) on blood pressure. Half of his subjects (chosen at random) do the bench presses first, have their blood pressure measured, rest for 10 minutes, do the parallel bar dips next, and have their blood pressure measured again. The other half of the subjects follow the same procedure, but do the dips first and the presses second. This experiment design is called (a) RCB crossover design. (c) sequential design (d) quasi-experiment e) CRD 3. THE ANOVA MANTRA A basic principle in experimental design is to for known variation in subjects, and to for unknown variation (c) randomize, balance b) blind, block (a) balance, blind e) block, randomize (d) match, randomize

Explanation / Answer

a) because A crossover design is a repeated measurements design such that each experimental unit receives different treatments during the different time periods

here physiologist also done different treatments at different time periods and repeated the treatment

b) block ,randomize

The basic principles of experimental designs are randomization, replication and local control. These principles make a valid test of significance possible

we call unknown variables to randomize

known variables to block

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