With the population explosion, scientists will have to come （）new methods of increasing the world’s food supply.

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• 具有相同性质或属性的个体所组成的集合称为总体(population)，它是指研究对象的全体。
• The test for the equality of two population variances is based on the
• A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability th