Researchers believe the 5-2-7 breathing exercise

helps managers make better decisions by keeping

them calm. Your company tests the effectiveness of

the 5-2-7 breathing exercise by randomly selecting

two groups of 28 managers each. All 56 managers

are presented the same amount of detailed fictional

company information, given a two-minute break,

and then asked to rapidly make seven multiplechoice

business decisions. During the two-minute

break, each manager in the first group does the

5-2-7 breathing exercise and managers in the other

group do not. Correct answer counts are recorded

for each manager. (Assume normality for each

population.)

5-2-7: n = 28, X-bar = 3.3, s = 1.36

none: n = 28, X-bar = 2.3, s = 1.35

Does this suggest the breathing exercise makes a

difference? Explain