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A researcher claims that the mean annual cost of raising a child (age 5 and under)...

A researcher claims that the mean annual cost of raising a child (age 5 and under) y husband-wife families in the U.S is $15,890. In a random sample of husband-wife families in the U.S., the mean annual cost of raising a child (age 2 and under) is $15363. The sample consists of 700 children. Assume the population standard deviation is $3125. Use 0.10 level of significance.

Math   Statistics-And-Probability   
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Answer #1

Here population standard deviation is known. So we have to use large sample test ( Z test for single mean).

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