Hamstrings Athletes who had suffered hamstringinjuries were randomly assigned to one of two exerciseprograms. Those who engaged in static stretchingreturned to sports activity in a mean of 15.2 days fasterthan those assigned to a program of agility and trunkstabilization exercises. (Journal of Orthopaedic & SportsPhysical Therapy 34 [March 2004]: 3)a) Explain why it was important to assign the athletes tothe two different treatments randomly.b) There was no control group consisting of athleteswho did not participate in a special exercise program.Explain the advantage of including such a group.c) How might blinding have been used?d) One group returned to sports activity in a mean of37.4 days 1SD = 27.6 days2 and the other in a meanof 22.2 days 1SD = 8.3 days2. Do you think thisdifference is statistically significant? Explain.
Hamstrings Athletes who had suffered hamstring
injuries were randomly assigned to one of two exercise
programs. Those who engaged in static stretching
returned to sports activity in a
than those assigned to a program of agility and trunk
stabilization exercises. (Journal of Orthopaedic & Sports
Physical Therapy 34 [March 2004]: 3)
a) Explain why it was important to assign the athletes to
the two different treatments randomly.
b) There was no control group consisting of athletes
who did not participate in a special exercise program.
Explain the advantage of including such a group.
c) How might blinding have been used?
d) One group returned to sports activity in a mean of
37.4 days 1SD = 27.6 days2 and the other in a mean
of 22.2 days 1SD = 8.3 days2. Do you think this
difference is statistically significant? Explain.
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