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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 ? = 10 milligrams per deciliter and standard deviation ? = 0.4 milligrams. A clinic measures the blood calcium of 100 healthy pregnant young women at their first visit for prenatal care. The mean of these 100 measurements is = 9.8. Is this evidence that the mean calcium level in the population from which these women come is less than 10? To answer this, the hypotheses H0: ? = 10, Ha: ? < 10 will be tested using the following rule:

Reject H0 only if < 9.907

The value 9.907 is called the:

A) critical value. B) test statistic. C) power value. D) significance value.

math   Statistics-And-Probability   
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