After taking ISEN 330, you fall in love with the field of human factors and ergonomics and start working on a research project on ICU nurses burnout. You submit a proposal to present your findings at the 2023 Human Factors and Ergonomics Society (HFES) conference which will take place in Washington D.C. You schedule a dry-run meeting with other members of the lab to present your slides and get feedback. The room you'll be presenting in at ETB is 30 ft * 40 ft. The screen is approximately located at the middle of the wall, and it is 20 (W)* 20 (H) feet. Assuming all members are licensed drivers in Texas. (a) What is the minimum height you should use for the characters and numerals in inches you put in your slides to ensure all attendance can read EVERYTHING on your slides (distinguished by a naked eye)? It is suggested to use a safety factor of 1.5 times the size of the absolute minimum height values. (1.2) (b) What minimum gap between characters and numerals should you use in inches (detected by a naked eye)? Please use the safety factor of 2.0. (1.0) 30 in 40 in LB