Caesarian birth study. In Exercise 4.56 (p. 187), you learned that 32% of all births in the United States occur by Caesarian section each year (National Vital Statistics Reports, Mar. 2010). In a random sample of 1,000 births this year, let x be the number that occur by Caesarian section.
a. Find the mean of x. (This value should agree with your answer to Exercise 4.56 a.)
b. Find the standard deviation of x. (This value should agree with your answer to Exercise 4.56 b.)
c. Find the z-score for the value x= 200.5.
d. Find the approximate probability that the number of Caesarian sections in a sample of 1,000 births is less than or equal to 200.
Caesarian births. The American College of Obstetricians and Gynecologists reports that 32% of all births in the United States take place by Caesarian section each year. (National Vital Statistics Reports, Mar. 2010).
a. In a random sample of 1,000 births, how many, on average, will take place by Caesarian section?
b. What is the standard deviation of the number of Caesarian section births in a sample of 1,000 births?
c. Use your answers to parts a and b to form an interval that is likely to contain the number of Caesarian section births in a sample of 1,000 births.
a. In a random sample of 1,000 births, how many, on average, will take place by Caesarian section?
b. What is the standard deviation of the number of Caesarian section births in a sample of 1,000 births?
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