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find z and p-value when population mean =12.4, population standard deviation= 1.8, sample size=90, and sample mean =12. (I am testing the null hypothesis: population

find z and p-value when population mean =12.4, population standard deviation= 1.8, sample size=90, and sample mean =12. (I am testing the null hypothesis: population mean >=12.4,. alternative hypothesis being population mean < 12.4, using a one tailed test)

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