- 3 - Plastic types Factory sources 1 3 4 5 6 1 69 69 79 84 84 92 2 57 63 68 68 73 79 3 72 76 79 83 84 97 (a) State the model and its appropriate assumptions. (b) By using ANOVA, determine whether the...

– Applied Statistical Methods

Extracted text: - 3 - Plastic types Factory sources 1 3 4 5 6 1 69 69 79 84 84 92 2 57 63 68 68 73 79 3 72 76 79 83 84 97 (a) State the model and its appropriate assumptions. (b) By using ANOVA, determine whether the three factory sources have different quality of plastic produced. Use a = 0.05. (c) Perform a pair-wise comparison of the means using the Duncan's multiple range test. Use a = 0.05.


Extracted text: Question 2 The durability of a plastic product is directly affected by the hardness of the plastic types used. Plastic hardness which is measured with the Durometer Hardness test goes between 0 and 100. A higher number represents a harder plastic. A comparative test is conducted to investigate the quality of the plastic based on their hardness from 3 different factory sources. The test is conducted with 6 different plastic types acquired from each factory source. The types of plastic are sorted based on the nature of hardness in ascending order.