Bluman A.G. Elementary Statistics- A Step By Step Approach

Instructor’s Section Answers18. Since r is not significant, no regression should be done.19. y 1.252 0.000398x; y 0.615 per dozen20. y 7.544 0.190x; 7.656, or 8 calls21. y 14.974 0.111x22. y 7.327 0.175x; 10.173 in23. y 8.994 0.1448x; 1.124. y 2.693 1.962x; 6225. y 2.417 0.055x; 19.6 grams26. y 206.399 9.262x; 613.927. y 22.659 0.582x; 48.26728. H 0 : r 0; H 1 : r 0; r 0.514; C.V. 0.811;do not reject. There is no significant relationship betweenthe number of fireworks in use and the number of relatedinjuries. No regression should be done.Injuries29. H 0 : r 0; H 1 : r 0; r 0.429; C.V. 0.811; do notreject. There is insufficient evidence to conclude arelationship exists between number of farms and acreage.Acreage13,00012,00011,00010,0009,0008,0007,00003502952401851302030. H 0 : r 0; H 1 : r 0; r 0.99; C.V. 0.811; reject.There is sufficient evidence to conclude a relationshipexists between verbal and mathematical scores.y 63.472 0.900x625600yyyFireworks and Injuries70 80 90 100 110 120Fireworks35 50 65 80Number of farms (in thousands)xx31. H 0 : r 0; H 1 : r 0; r 0.970; C.V. 0.707; reject;y 33.358 6.703x; when x 500, y 3318.142.There is a significant relationship between number ofemployees and tons of coal produced.Tons (thousands)32. H 0 : r 0; H 1 : r 0; r 0.839; C.V. 0.632; reject.There is a significant linear relationship between thenumber of viewers of last year’s show and the numberof viewers of the same shows this year. y 3.668 1.281xThis year (millions)33. H 0 : r 0; H 1 : r 0; r 0.981; C.V. 0.811;reject. There is a significant relationship between thenumber of absences and the final grade;y 96.784 2.668x.Final grade987654321y3028262422201816141214y1009080706050Tons of Coal and Number of Employeesyy' = –33.358 + 6.703x0 200 400 600 800 1000 1200EmployeesViewers for Two Yearsy 3.668 1.281x16 18 20 22 24 26Last year (millions)28Absences and Final Gradesy' = 96.784 – 2.668x0 2 4 6 8 10 12Number of absencesxxxMath575550525500500y' = 63.472 + 0.900xx525 550 575 600Verbal scoreIS–55