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The level of calcium in the blood of healthy young adults follows a normal distribution, with...

The level of calcium in the blood of healthy young adults follows a normal distribution, with mean μ = 10 milligrams per deciliter and standard deviation σ = 0.4. A clinic measures the blood calcium of 43 healthy pregnant young women at their first visit for prenatal care. The mean of these 43 measurements is ? = 9.8. Is this evidence that the mean calcium level in the population from which these women come is less than 10? Give the value of z, the P value, and the 95% confidence interval for μ. Would we reject or fail to reject H0 at α = .05? Then explain in a complete sentence what your conclusion means.

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