A psychologist is aware of studies showing that the variability of attention spans of 5-year olds can be summarized by σ 2 = 64 minutes squared. She wonders whether the attention span of 6-year-olds is different. A sample of twenty 6-year-olds gives s2 = 28 minutes squared.
- State explicit null and alternative hypotheses.
- Test your hypotheses at the α = 0.05 level.
- State an explicit conclusion.
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