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July 2, 2015

Homework Help: statistics

Posted by Ashley on Thursday, June 30, 2011 at 2:13pm.

The proportion of baby boys born in the United States has historically been 0.512. You choose an SRS of 55 newborn babies and find that 47% are boys. Do ALL calculations to 5 decimal places before rounding.

(d) In a random sample of 55 newborn babies, what is the probability that 47% of the sample are boys. (Use 3 decimal places). Hint: you are asked to find P( < .47 ). To calculate this first find the z-score and then look up the answer in the Z table.

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