Fred and Ricky Are Identical Twins

question 64

Multiple Choice

Fred and Ricky are identical twins.Lucy and Ethel are fraternal twins.If intelligence is primarily a genetic trait,we would expect that

• A)Lucy's and Ethel's IQ scores would be more similar to each other than Fred's IQ score would be to Ricky's.
• B)Fred's and Ricky's IQ scores would be more similar to each other than Lucy's IQ score would be to Ethel's.
• C)All four of the twins would have similarly close IQ scores.
• D)Fred and Ricky would both have lower IQ scores than either Lucy or Ethel.

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Definitions:

Standard Normal Distribution

A special case of the normal distribution with a mean of zero and a standard deviation of one.

Probability

A measure of the likelihood of a specific event or outcome, expressed as a number between 0 and 1.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values, indicating how much the individual values in a dataset deviate from the mean of the dataset.

Random Variable

A variable that can take on numerical results from a random event.