Influenza Positive Tests Reported to CDC by U.S. WHO/NREVSS Collaborating Laboratories, National Summary, 2013-14 40 5,500 5,000200HIN 4,500 4,000 -Percet Positive 35 A043) 400 300 8 30 225 D 3,500 23,000 2,500 2,000 5 1,500 1,000 500 100 20 C 15 0 Week

Every year the CDC tracks cases of the flu and identifies the viral strains responsible (see graph above). What kind of data is being collected? O a. epidemiological data Ob. clinical trial data O c. it is impossible to tell from the information given Check Answer Value: 1 Chimerix is hard at work developing broad-spectrum anti-viral drug called brincidofovir. They are interested in testing it in Ebola patients to see if it’s effective agains the Ebola virus. What kind of study will they need to do to show if it’s safe and effective? O a. an epidemiological study O b. a clinical trial O c. it is not possible to tell with the information given Check Answer Value: 1 In the brincidofovir study, what is the control group? a, the patients who received a sugar pill O b. the patients who received brincidofovir c. the type of medicine O d. the survival rate Check Answer Value: 1 In the brincidofovir study, what is the experimental group? O a. the patients who received a sugar pill b. the patients who received brincidofovir c, the type of medicine O d. the survival rate Check Answer

In the brincidofovir study, what is the independent variable? a. the patients who received a sugar pill b. the patients who received brincidofovir O c. the type of medicine d. the survival rate Check Answer Value: 1 In the brincidofovir study, what is the dependent variable? O a. the patients who received a sugar pill O b. the patients who received brincidofovir c, the type of medicine O d. the survival rate Check Answer Refer to this graph for the next question Per capita consumption of cheese (US) Number of people who died by becoming tangled in their bedsheets 34 -900 -800 700 600 – 500 -400 r 300 32 75 31.5 30.25 29 2000 2001 2003 2004 2005 2 2006 2002008 2009 Value 1 What is the problem twth this graph? O a. It shows a correlation, but not a causal relationship b. It shows a causal relationship, but not a correlation с.t shows both a correlation and a causal erfect-there is no problem with this graph