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a sample of 2000 was sought to estimate the average achievement in science of fifith graders in a city public schools. the average fifth grade enrolment in the citys elementary schools is 100 students thus 20 schools were randomly selected and within each of thoise all fifth graders was tested

Sagot :

Answer:

random sampling

Step-by-step explanation:

2000 ÷ 20 = 100