# Screenshot 2023-08-09 at 2.13.52 PM

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Determine whether the following results appear to have statistical significance, and also determine whether the results have practical significance. Most people have IQ scores between 70 and 130. For approximately \$39.99, you can purchase a PC or Mac program from HighlQPro 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 researchers could find no substantial data supporting that claim, so suppose that in a study of 11 subjects using the program, the average increase in IQ score is 4 1Q points. There is a 40% chance of getting such results if the program has no effect. Does the 1Q-increasing software have statistical significance? Yes, the software is statistically significant because the results are unlikely to occur by chance. Yes, the software is statistically significant because the results are likely to occur by chance. No, the software is not statistically significant because the results are unlikely to occur by chance. v No, the software is not statistically significant because the results are likely to occur by chance. Does the 1Q-increasing software have practical significance? v No, the software is not practically significant because the number of IQ points gained is very small. Yes, the software is practically significant because the number of IQ points gained is large enough to be considered practically significant. No, the software is not practically significant because the results are likely to occur even if the software has no effect. Yes, the software is practically significant because the results are too unlikely to occur by chance.