What are the null and alternative hypotheses in (a) a lower-tail test for a population mean? (b) a two-tailed test for a population mean? (c)

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What are the null and alternative hypotheses in

(a) a lower-tail test for a population mean?

(b) a two-tailed test for a population mean?

(c) an upper-tail test for a population mean?

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What are the null and alternative hypotheses in (a) a lower-tail test for a population mean? (b) a two-tailed test for a population mean? (c)

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