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4. The following data represent the number of hours of pain relief provided by 5 different brands of headache blets administered to 25 subjects. The 25 subjects were randomly divided into 5 groups, and each group was treated with a different brand. 9 6 9 6 7 Perform the analysis of variance, and test the hypothesis at the 0.05 level of significance that the mcan number of hours of relicf provided by the tablets is the same for all five brands. ANOVA Table: Sources of Degrees of F-value Sum of squares Mean square Computed Tabular variation Between groups Within groups Total Step H: Step 2 Test statistic to be used Step 3 Critical value of the test statistic Step 4 Computed value of the test statistic: Step 5 Decision: Conclusion

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QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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  Introduction To find incremental revenue and cost, we subtract Current revenue and cost from Projected revenue and cost. Answer Current Situation Projected Sales and Profit Incremental Revenues and Costs Total Revenue Php1,500,000 Php1,800,000 + Php3000,000 Variable Cost 575,000 425,000 - Php 332,000 Direct Fixed Costs 625,000 700,000 + Php 75,000 Indirect Fixed Costs 100,000 100,000 No change Profit Php 200,000 Php 575,000 + Php 375,000 Profit increases by Php 375,000, thus a new camera and coffee maker must be purchased.

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