1. A researcher used a developed problem solving test to randomly select 50 Grade 6 pupils. In this sample, x = 80 and s = 10. The u and the standard deviation of the population used in the standardization of the test were 75 and 15, respectively. Use the 95% confidence level to answer the following questions: a. Does the sample mean differ significantly from the population mean? b. Can it be said that the sample mean is above average?

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