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Mathematics 21 Online
OpenStudy (alison123):

Q scores follow a Normal distrbution with standard deviation σ=15. Treat these 31 girls as an SRS of all 7th grade girls in the district. IQ scores in a borad population are supposed to have a mean of μ=100. Is there evidence that the mean in this district differs from 100? The mean of the district is 105.84

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