Psychologists have been wrestling with the question of whether the birth order of children affects their intelligence.

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Psychologists have been wrestling with the question of whether the birth order of children affects their intelligence. A study conducted in Norway took random samples of teenagers 18 and 19 years old from families with three children. An IQ test was administered and recorded. The mean IQ of all people is 100. Do the data provide sufficient evidence to infer that the average IQ of the eldest child is greater than the overall mean?

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