A pavement engineer is attempting to study the effect 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 significance level, conduct a suitable statistical test to prove or disprove the engineer’s claim.

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A pavement engineer is attempting to study the effect 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 significance level, conduct a suitable
statistical test to prove or disprove the engineer's claim.
Transcribed Image Text:A pavement engineer is attempting to study the effect 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 significance level, conduct a suitable statistical test to prove or disprove the engineer's claim.
Table Q2: Results of indirect tensile strength tests on asphalt concrete (AC) without and with
polypropylene (PP) as an additive
Indirect Tensile Strength (MPa)
Test
AC Without PP
AC With PP
1
0.93
1.23
2
1.02
1.06
3
0.87
0.89
4
0.95
1.05
5
1.04
1.30
1.12
1.56
0.78
0.87
8
0.65
0.76
1.07
1.34
10
0.99
1.22
11
0.87
0.98
12
1.08
1.15
67
Transcribed Image Text:Table Q2: Results of indirect tensile strength tests on asphalt concrete (AC) without and with polypropylene (PP) as an additive Indirect Tensile Strength (MPa) Test AC Without PP AC With PP 1 0.93 1.23 2 1.02 1.06 3 0.87 0.89 4 0.95 1.05 5 1.04 1.30 1.12 1.56 0.78 0.87 8 0.65 0.76 1.07 1.34 10 0.99 1.22 11 0.87 0.98 12 1.08 1.15 67
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