# IQ Scores Most people have IQ scores between 70 and 130. For \$39.99, you can purchase a PC or Mac program from HighIQPro that is claimed to increase your IQ score by 10 to 20 points. The program claims to be “the only proven IQ increasing software in the brain training market,” but the author of your text could find no data supporting that claim, so let’s suppose that these results were obtained: In a study of 12 subjects using the program, the average increase in IQ score is 3 IQ points. There is a 25% chance of getting such results if the program has no effect.

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IQ Scores Most people have IQ scores between 70 and 130. For \$39.99, you can purchase a PC or Mac program from HighIQPro that is claimed to increase your IQ score by 10 to 20 points. The program claims to be “the only proven IQ increasing software in the brain training market,” but the author of your text could find no data supporting that claim, so let’s suppose that these results were obtained: In a study of 12 subjects using the program, the average increase in IQ score is 3 IQ points. There is a 25% chance of getting such results if the program has no effect.

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Step 1

In this case, we need to check whether the result has statistical and practical significance.

Step 2

Statistical significance:

In the study, when the result obtained is very unlikely to occur just by chance alone, then statistical significance is achieved. The general criterion for statistical significance is the likelihood of occurring of an event just by chance is 5% or less. When a treatment is tested, the statistical significance gives the conclusion about how the treatment is unlikely to be effective just by chance a...

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