Statistics

A researcher is interested in hemispheric specialization in the brain. She has n = 16 students to identify letter strings flashed onto a scree as either words or nonwords. The letter strings are first flashed onto the right and the left sides of the scree. She then compares the number of words flashed onto the right side of the screen that were mistakenly identified as nonwords with the number of words flashed on the left side of the screen that were mistakenly identified as nonwoords. She expects fewer mistakes with words flashed onto the right side of the screen.

Difference will be calculated by subtracting the number of mistakes made of works flashed onto the right side of the screen from this made on words flashed onto the left side of the screen (Left – Right).

1) This is a ________ - tailed test? One or two tailed test?

What are null and alternative hypothesis?