Formulas R 3 R R DAR p p - 3vp(1 -p) p + 3vp(1 -p) x (with s) X - A35 * + A35 S B35 S BAS X x - 3R/d2 * + 3R/d2 no np - 3vnp(1 -p) np + 3vnp(1 -p) C 2 - 3VC 2+ 3 VC Cengage Learning U U - 3vu u +3vui Question 25 (10 points) = ) Listen The City of Toronto is monitoring new safety measures installed on Danforth Avenue. These include, reduced left-hand turns combined with left turn lanes, narrowed lanes, dedicated loading areas, and 'pedestrianading interval' at intersections. To study and monitor the effects on travel time they have access to data showing travel time for many individual vehicles and average travel time in seconds (daily), through the study area. There will be thousands of vehicles every day. a) What type of control chart(s) would you use AND why? (5 marks) b) What is important in this data in ADDITION to the AVERAGE? Why? (5 marks) A G P S [X 9 wFIGURE 8.49 Control Chart Selection Quality characteristic Variable Attribute Type of attribute X - and moving range no charts yes Defective Defect n 2 10 or Constant yes p- or np- Constant yes- computer no X- and R-charts sample available? chart sampling size? unit? no C-chart no yes p-chart with x- and s-charts variable sample U-chart size Cengage Learning TABLE 8.5 Summary of Type of Chart LCL CL UCL Control Chart X (with R) X - A2R X + A2R Formulas R D3 R R DAR p p -3vp(1 - p) p p + 3vp(1 -p) x (with s) X - A35 * + A35 S B35 S BAS X X - 3R/ dz X x + 3R/d2 np np - 3vnp(1 -p) np np + 3vnp(1 -p) C C- 3va Cengage Leaming U U- 3vu; U u + 3vui Question 25 (10 points) ) Listen The City of Toronto is monitoring new safety measures installed on Danforth Avenue. These include, reduced left-hand turns combined with left turn lanes, narrowed lanes, dedicated loading areas, and 'pedestrianading interval' at intersections.FIGURE 8.49 Control Chart Selection Quality characteristic Variable Attribute Type of attribute X - and moving range no charts yes Defective Defect n 2 10 or Constant yes p- or np- Constant yes- computer no X- and R-charts sample available? chart sampling size? unit? no C-chart no yes p-chart with x- and s-charts variable sample U-chart size Cengage Learning TABLE 8.5 Summary of Type of Chart LCL CL UCL Control Chart X (with R) X - A2R X + A2R Formulas R D3 R R DAR p p -3vp(1 - p) p p + 3vp(1 -p) x (with s) X - A35 * + A35 S B35 S BAS X X - 3R/ dz X x + 3R/d2 np np - 3vnp(1 -p) np np + 3vnp(1 -p) C C- 3va Cengage Leaming U U- 3vu; U u + 3vui Question 25 (10 points) ) Listen The City of Toronto is monitoring new safety measures installed on Danforth Avenue. These include, reduced left-hand turns combined with left turn lanes, narrowed lanes, dedicated loading areas, and 'pedestrianading interval' at intersections