4. A woman who smokers during pregnancy increase health risks to the infant so that it...

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4. A woman who smokers during pregnancy increase health risks tothe infant so that it is known that about 20% (1/5) of femalesmokers quit smoking during pregnancy. Suppose that a random sampleof 400 pregnant women who smoked prior to pregnancy contained 62who quit smoking during pregnancy.
a. What is the point estimator for p, the population of femalesmokers who quit smoking during pregnancy?
b. What are the assumptions (requirements) for constructing aconfidence interval for p?

c. Compute the 95 % confidence interval for p.

d. Find the margin of error from part c.

e. Interpret the confidence interval you found in part c.

f. Does the result from c) agree with the claim saying, â€œabout 20%(1/5) of female smokers quit smoking during pregnancyâ€?

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Solution a Point estimate sample proportion x n 62400 0155b n 400x 62Point estimate sample proportion x n 62400 01551 10155 0845b At 95 confidence level See Answer

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