Suppose you examine an ultrasound image of a fetus, who is sucking her left thumb. Generalizing from research presented in the text, what is the probability that this fetus will be left-handed at age 15?
A) about 50%
B) about 67%
C) about 85 %
D) about 100%

Question

Quizplus · Accepted Answer

Research has shown that handedness may develop very early. Using ultrasound, fetuses were observed sucking their thumbs, and they were 8 times more likely to be sucking the thumb on their right hand (Hepper, Wells, & Lynch, 2005). When these fetuses were followed to ages 10 to 12 years, of the 15 "left-thumb" fetuses, 5 had become right-handed.

Suppose You Examine an Ultrasound Image of a Fetus, Who