A researcher wants to understand the effects of different flooring materials on the perceived distraction caused by echoing sounds of conversation, measured on a scale from 1 (minimal sound) to 7 (very distracting). He samples 100 participants and randomly assigns them to four unique, equally-sized groups: 1) a wood floor, 2) a concrete floor, 3) a carpeted floor, and 4) a floor with a plush rug. Each participant is asked to complete a moderately difficult arithmetic task while recorded conversation is played in the room. The data from this experiment are presented below. Complete the ANOVA Summary Table and make a decision regarding the null hypothesis, using an a = 0.01. Wood Concrete Carpet Plush Rug Total n 25 25 25 25 100 M 5.88 6.04 4.25 5.21 5.34 S 0.80 0.81 0.79 0.83 1.06 ΣΧ 141 145 102 125 513 Σχε 843 891 448 667 2849 ANOVA Summary Table (Note: Report all calculated values to two decimal positions) Source SS Between- Groups Error Total Critical Value for F: df Decision Regarding Ho (Retain or Reject): MS F n²