A. presence of carbon in petrol
B. dehydrogenation of petrol
C. incomplete combustion of petrol
D. presence of additives in petrol
E. contamination of petrol with diesel
Correct Answer:
Option D – presence of additives in petrol
Hypothesis Testing
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Sampling Error And Sampling Bias
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Sample And Sampling Techniques
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Sources Of Literature - Project Writing
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Research Proposal Vs Research Abstract - Educational Research
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