Polyester resins reinforced with fiberglass are used to fabricate wall panels of restaurants. It is theorized...

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Polyester resins reinforced with fiberglass are used tofabricate wall panels of restaurants. It is theorized that addingcement kiln dustâ€‹ (CKD) to the polyester composite will increasewall panel hardness. In aâ€‹ study, hardnessâ€‹ (joules [J] persquaredâ€‹ centimeters) was determined for three polyester compositemixtures that used aâ€‹ 40% CKD weight ratio. The hardness valueswere reported as 83, 82â€‹, and 77 J/cm^2. Research hasshown that the mean hardness value of polyester composite mixturesthat use aâ€‹ 20% CKD weight ratio is Î¼ = 76 J/cm². Inyourâ€‹ opinion, does using aâ€‹ 40% CKD weight ratio increase the meanhardness value of polyester compositeâ€‹mixtures? Support youranswers statistically.

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Null hypothesis H0 Mean hardness value of polyester compositemixtures that use a 40 CKD weight ratio is equal to mean hardnessvalue of polyester composite mixtures that use a 20 CKD weightratio That is Mean hardness value of polyester composite mixturesthat use a 40 CKD weight ratio is equal to76Jcm2Alternative hypothesis Ha Mean hardness value of polyestercomposite See Answer

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