I. How many more first-time jobless claims were filed in week P than in Week T? (1) For weeks P,Q,R and S, the average (arithmetic mean) number of first time jobless claims filed was 388,250 (2) For weeks Q,R,S, and T, the average (arithmetic mean) number of first time jobless claims filed was 383,000. II. [...]

Clarinet reeds often lose their freshness become less responsive  after a few weeks of intense use. One clarinetist has hypothesized that a buildup of oil, rather than changes in the material properties of the reed, were responsible. Which of the following investigations is most likely to yield significant information that would help to evaluate the [...]