In factorial experiments, researchers are limited to __________ levels within any of the included independent variables

Amy is three years old and has 20/40 vision. What does this mean?

A) Amy's visual acuity is average for a three-year-old. B) In order for Amy to see an object, she has to be 20 feet away from it, whereas most people can see the object from 40 feet away. C) Amy is considered legally blind. D) In order for Amy to see an object, she has to be 40 feet away from it, whereas most people can see the object from 20 feet away.

Reading is a complex process that requires the reader to derive meaning from an otherwise meaningless array of lines and curves. An initial aspect that should be considered is:

A) problem solving B) intelligence C) pattern recognition D) imagery E) a linguistic hierarchy