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A researcher used a developed problem solving test to randomly selected 50 Grade 6 pupils. In the sample X=80 and 5:10. The mean and standard

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A researcher used a developed problem solving test to randomly selected 50 Grade 6 pupils. In the sample X=80 and 5:10. The mean and standard deviation ofthe population used in the standardization of the test were 75 and 15, respectively. Use the 95% confidence level to answer the following questions

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