Scores on a Standard IQ Test Are Normally Distributed with Population

question 90

Multiple Choice

Scores on a standard IQ test are normally distributed with population standard deviation 15.How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of 0.5) and we want 97% confidence in the results?

• A)4,239
• B)283
• C)212
• D)131
• E)66

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Definitions:

Neutrons

Subatomic particles found in the nucleus of an atom, with no electric charge and a mass slightly greater than that of protons.

Lewis Structure

A diagram that represents the valence electrons of atoms within a molecule, illustrating the bonding between atoms and the existence of lone pairs of electrons.

Acetic Acid

A weak, organic acid that gives vinegar its characteristic smell and sour taste; used as a chemical reagent.

Lone Pairs

Electron pairs in the outer shell of an atom that are not involved in chemical bonding.