A study had subjects read a passage and take a comprehension test on what they read. The researchers randomly assigned subjects so that half of them listened to music with lyrics while reading, while the other half listened to music without lyrics while reading. Here are their scores on the comprehension test: Music with lyrics 75 62 65 41 54 Music without lyrics 64 71 88 77 62 The researchers want to test if these results represent a significant difference in the average score between the groups. Assume that the necessary conditions for inference were met. Which of these is the most appropriate test and alternative hypothesis?