In 2007, a Study of Close to 250,000 18-19 Year-Old

question 63

Essay

In 2007, a study of close to 250,000 18-19 year-old Norwegian males found that first-borns have an IQ that is 2.3 points higher than those who are second-born. To see if you can find a similar evidence at your university, you collect data from 250 students, of which 140 are first-borns. After subjecting each of these individuals to an IQ test, you find that the first-borns score 108.3 with a standard deviation of 13.2, while the second borns achieve 107.1 with a standard deviation of 11.6. You hypothesize that first-borns and second-borns in a university population have identical IQs against the one-sided alternative hypothesis that first borns have higher IQs. Using a size of the test of 5%, what is your conclusion?

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Definitions:

Apraxia

A neurological disorder characterized by the inability to perform learned (familiar) movements on command, despite the desire and the physical ability to perform the movements.

Executive Functioning

Cognitive processes that allow for planning, decision-making, error correction, and regulation of behavior.

Dinner Party

A social gathering where people come together to eat dinner, often in a private home, but may also refer to any formal meal occasion.

Stuttering

A speech disorder characterized by repetitive or prolonged sounds or syllables, interrupting the normal flow of speech.