A Researcher Is Interested in Investigating Whether People Perform Better

Multiple Choice

A researcher is interested in investigating whether people perform better at dexterity tests while listening to classical music or to no music.He designs a dexterity test,and first gives it to his participants while classical music is playing,and then while no music is playing.

A) Paired t-test,since there are two sets of measurements on the same subjects,providing a natural linking.
B) One-sample t-test,since there is only one sample of subjects taking the dexterity tests.
C) z-test,since the researcher can find the standard deviation of his population.
D) Two-sample t-test,since how a subject performs with music should have no influence on how he performs without music,creating two independent samples.
E) Not enough information is given to determine the best type of test.