Eighteen technicians in a cell phone repair shop are randomly selected to participate in a study comparing two screen repair techniques. They are randomly assigned one of the two techniques. The manager trains 9 technicians on one technique and trains the other 9 technicians on the second technique. He then records the number of screen repairs each technician does in one week. Which inferential statistical test would be most appropriate for this scenario?

a. A one-sample z-test
b. A paired t-test
c. A chi-square goodness-of-fit test
d. A one-sample t-test
e. A two-sample t-test