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Researchers want to know if the mean hemoglobin level (u) for children who have been exposed...

Researchers want to know if the mean hemoglobin level (u) for children who have been exposed to high levels of lead is lower than 12.29 g/100ml (the mean hemoglobin level for normal children). It is known that the population standard deviation of hemoglobin is 0.85 g/100ml. A random sample of 74 children exposed to high levels of lead has a sample average hemoglobin level of 10.6 g/100ml. Test H0 : u ≥ 12.29 vs. H1 : u < 12.29 at the 5% level of significance.

Math   Statistics-And-Probability   
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as test statistic is in critical region we reject null hypothesis and conclude that  mean hemoglobin level (u) for children who have been exposed to high levels of lead is lower than 12.29 g/100ml

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