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A pavement engineer is attempting to study the e'ect of adding polypropylene (PP) to asphalt concrete. The engineer claims that PP can improve the strength of asphalt concrete. Results of indirect tensile strength tests on asphalt concrete samples with and without PP are shown in Table Q2. At the 0.05 signicance level, conduct a suitable statistical test to prove or disprove the engineer's claim. (25 marks) Table Q2: Results of indirect tensile strength tests on asphalt concrete (AC) without and with polypropylene (PP) as an additive Indirect Tensile Strength {MPa} AC Without PP AC With PP 0.93 1.23 1.02 1.06 0.8? 0.89 0.95 1.05 1.04 1.30 1.12 1.56 0.?8 0.8? 0.65 0.76 l .3 4 l .22 0.98 l . 1 5