Question: Test a claim that a population mean equals 450. The obtained sample mean from the sample of 280 items was 545. Assume the population standard

Test a claim that a population mean equals 450. The obtained sample mean from the sample of 280 items was 545. Assume the population standard deviation = 130. Use .01 significance level for testing the claim

**The critical values of Z at .01 level of significance are:

One-tailed plus or minus 2.33

Two-tailed plus or minus 2.58

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