An experiment was conducted to determine if the right hand is generally stronger than the left in right-handed people. Hand strength can be crudely measured by placing a bathroom scale on a shelf with the end protruding and then squeezing the scale between the thumb below and the four fingers above. The reading of the scale shows the force exerted.
A.
Create two groups and ask the subjects in each group to use one of the hands to squeeze the scale. Use a coin to decide which subject in a group will use which hand.
B.
Ask each subject to squeeze the scale using both hands, one after the other. Toss a coin to decide which hand they should use first.
C.
Divide all subjects randomly into two groups and ask subjects in each group to use either hand.
Answer: B.
Ask each subject to squeeze the scale using both hands, one after the other. Toss a coin to decide which hand they should use first.
Identify the randomization for a matched pairs design to compare the strength of the right and left hands, using 10 right-handed people as subjects.
A.
Create two groups and ask the subjects in each group to use one of the hands to squeeze the scale. Use a coin to decide which subject in a group will use which hand.
B.
Ask each subject to squeeze the scale using both hands, one after the other. Toss a coin to decide which hand they should use first.
C.
Divide all subjects randomly into two groups and ask subjects in each group to use either hand.
Answer: B.
Ask each subject to squeeze the scale using both hands, one after the other. Toss a coin to decide which hand they should use first.
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