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...

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.

Extracted text: Plastic types Factory sources 1 2 3 4 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. By using ANOVA, determine whether the three factory sources have different (b) quality of plastic produced. Use a = 0.05. Perform a pair-wise comparison of the means using the Duncan's multiple range test. Use a = 0.05. (c) 3.