Suppose you are calculating a 95% confidence interval for the mean difference using paired data to compare the number of words memorized by people while listening to music compared to the number of words memorized by the same people while not listening to music. The observed mean difference is x?_{no music – music} and you calculate your interval to be (–0.50, 1.80). This interval can be interpreted as saying that we are 95% confident that in the population: 

A. On average, the number of words memorized is between 0.50 fewer words to 1.80 more words when there’s music compared to no music. 

B. On average, the number of words memorized is between 0.50 fewer words to 1.80 more words when there’s no music compared to music. 

C. On average, the number of words memorized is between 0.50 to 1.80 more words when there’s no music compared to music. 

D. On average, the number of words memorized is between 0.50 to 1.80 fewer words when there’s no music compared to music.