Researchers wanted to determine if listening to music affected memory capacity. In a test, 80 subjects were randomly assigned to listen to either classical music or no music. After 10 minutes, the subjects were asked to look at a poster with pictures of 20 common objects for 5 minutes. After waiting 10 minutes, the subjects were asked to list as many of the objects as they could recall. Of the 44 subjects who listened to classical music, 75 % were able to list at least half of the objects. Of the 36 subjects who listened to no music, 50 % were able to list at least half of the objects. Let p 1 be the population proportion of subjects who listened to classical music and were able to list at least half of the objects, and let p 2 be the population proportion of subjects who listened to no music and were able to list at least half of the objects. What type of test is this hypothesis test? Select the correct answer below: This is a left-tailed test because the alternative hypothesis is H a : p 1 p 2 < 0 . This is a left-tailed test because the alternative hypothesis is H a : p 1 p 2 > 0 . This is a right-tailed test because the alternative hypothesis is H a : p 1 p 2 > 0 . This is a right-tailed test because the alternative hypothesis is H a : p 1 p 2 < 0 . This is a two-tailed test because the alternative hypothesis is H a : p 1 p 2 0