1. Researchers studied the effect of driving while texting on driving mistakes. College students were recruited to participate in the study. Due to risk of actual driving on the road, researchers conducted the research in a lab with a driving simulator. Students were randomly assigned to one of the two groups: (1) "driving without texting" or (2) "driving while texting." Driving mistakes were recorded by the simulator, which include driving more than 10 miles above or below the speed limit and failing to stay within the lane. What type of research was this study? What was the independent variable in this study? What was the dependent variable in this study? 2. Researchers investigated the gender gap in pay for physicians. An online salary survey was sent out to the members of the American Medical Association with an electronic link. What type of research was this study? What kind of sample was likely to be obtained by this online survey? 3. Where X = 1, 2, 3, and 4. and Y = 2. 4. 6, and 8. compute E(X - 3)(Y - 5) and EX- Y. 7. Which of the following pairs is usually unknown parameters of the population? a. X and p b. s and a c. s and o' a. u and o