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Based on anecdotal evidence (i.e., nonrandom, small samples), some have hypothesized that IQ scores have actually...

Based on anecdotal evidence (i.e., nonrandom, small samples), some have hypothesized that IQ scores have actually improved among recent birth cohorts. When a particular IQ test was validated in the 1990s, the mean was 100, with a standard deviation of 15. Suppose I hypothesize that current IQ now has a population mean of 110 (with a standard deviation of 15). I take a random sample of 20 people and find mean is 105. What can I say about my hypothesis?

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