Question: In an experiment testing a method of gender selection intended to increase the likelihood that a baby is a girl, 1000 couples give birth to

In an experiment testing a method of gender selection intended to increase the likelihood that a baby is a girl, 1000 couples give birth to 501 girls and 499 boys. An analyst argues that this fails to provide evidence that the method has any effect, because the probability of getting these results by chance is 0.487, or almost 50%.

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