Karen took a test designed to measure her musical aptitude two times, and she earned the same score both times. This test of musical aptitude is definitely

Advanced topic: The statistic used to determine the power of a t test for independent means when the sample sizes are unequal is the __________

Fill in the blanks with correct word

When identical twins are raised together in the same home, and they show different susceptibilities to a given psychological disorder, it indicates that:

a. environmental factors influence the expression of the disorder b. genetic factors have more influence than environmental factors in the disorder c. both genetics and environmental factors contribute equally to the disorder d. neither genetic factors nor environmental factors contribute to the disorder