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Como o texto fala de amostragem HAPHAZARD e RANDOM, vou chamar RANDOM de amostragem aleatória. Estava chamando HAPHAZARD de aleatória até chegar neste ponto, mas agora preciso mudar. Sugestões?

Haphazard Selection – the tester manually selects a sample without following a structured technique, avoiding any intentional bias to include or exclude items in the population. Although haphazard sampling is unbiased by nature it differs from random sampling, which requires extreme objectivity with no human intervention and uses a computer or random number table to mathematically identify the items to be sampled (see section 3.2.1 for further explanation).

Obrigado a todos!