Question

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 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 researchers could find no substantial data supporting that​ claim, so suppose that in a study of 14 subjects using the​ program, the average increase in IQ score is 4 IQ points. There is a 28​% chance of getting such results if the program has no effect.

Answer 1

Considering the p-value of the test, it is found that the result has neither statistical nor practical significance, as it does not give sufficient evidence that the IQ is increases by 10 to 20 points.

What is the relation between the p-value and the conclusion of the test hypothesis?

Depends on if the p-value is less or more than the significance level:

• If it is more, the null hypothesis is not rejected.

• If it is less, it is rejected.

In this problem, the p-value is of 0.28, which is greater than 0.05, hence there is not enough evidence that the IQ increase is as stated, meaning that the result has neither statistical nor practical significance.

More can be learned about p-values at brainly.com/question/16313918

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