Cora is a video game designer. She believes that games played using virtual reality headsets will be perceived by students as more challenging. She proposes an experimental study to examine this belief. Identify the independent variable in this study.
Identify the control group in this study.
Provide a valid operational definition of “challenging” in this study.
Explain how random assignment would help establish cause and effect in this study.
Explain why it would be difficult to use a double-blind procedure for this study.
Explain how a variable-ratio schedule of reinforcement might relate to someone playing a video game.

1. the or shop owner initiates the repair order. a. service manager b. foreman c. customer d. service consultant student a incorrect reference: section 5.1 2. the repair order is routed to the who computes the bill based on information supplied by the technician and shop policy. a. service manager b. foreman c. service consultant d. accountant student c incorrect reference: section 5.1 8. is used in windshield washer fluid to prevent freezing and dissolve bugs. a. propanol b. brake fluid c. alcohol-additive (methanol) d. ethylene glycol student a incorrect reference: section 5.3 9. all of these acts are performed when doing an oil and filter change except a. lifting the vehicle to your best working height. b. putting the drain pan under the oil-drain plug. c. using safety glasses with side shields. d. loosening the drain plug with a screwdriver. student c incorrect reference: section 5.2 10. coolant should be clear, not clouded from contamination, and should feel a. slippery. b. hot. c. cool. d. sticky. student c incorrect reference: section 5.3 11. the device in the above photo is used to check the coolant a. level. b. acid level. c. temperature. d. thickness. student c incorrect reference: section 5.3 14. some vehicles require the use of a to check the level of the fluid. a. scan tool b. micrometer c. feeler gauge d. manometer student d incorrect reference: section 5.3 17. the type of oil used in a vehicle is determined by the oem specifications and the oil which is listed in the owner’s manual, online service information, and on the oil fill cap. a. pressure b. viscosity c. density d. type student c incorrect reference: section 5.2 18. one of the first jobs a new technician does in the shop is a. tire service. b. transmission work. c. lubrication service. d. front-end work. student a incorrect reference: section 5.2 plzzz