1) What is the percentage of preterm births in 2016 for mothers under 20 years old? 3.20% 7.20% 10.40% Correct The percentage of all preterm births in 2016 for mothers under 20 years old is 7.20%+3.20%=10.40%. 2) What is the percent increase in preterm births for all ages between 2015 and 2016? 0.22% 9.63% 9.85% 3) Which age group showed the largest percentage of late preterm births in 2016? Under 20 20−29 30−39 40 and over
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The National Vital Statistics Reports for November 2011 states that the U.S. preterm birth rate for 2010 was about 12%. Preterm birth means premature birth. Is the percentage of preterm births lower this year? Suppose that this year we select a random sample of 50 births. The conditions are not met for use of a normal model since the expected number of preterm births is only 6 (12% of 50). So we ran a simulation with p = 0.12. Suppose that the sample of 50 babies has 4 that are preterm. This is 8% of the sample. 512 out of 2,000 random samples have a sample proportion of 0.08 or lower. This is 25.6%. Do the data suggest that the percentage of preterm births in the U.S. is lower than 12% this year? A. Yes, because only 8% are preterm this year which is lower than 12%. B. Yes, because sample proportions of 0.08 or less are unusual given the population proportion is 0.12. C. No, because sample proportions of 0.08 or less are not unusual if the proportion of preterm births in the population is 0.12. D. No, because a 25.6% of the babies are preterm this year which is much higher than 12%.
David N.
The data on the right represent the number of live multiple-delivery births (three or more babies) in a particular year for women 15 to 54 years old. Use the data to complete parts (a) through (d) below. Age | Number of Multiple Births 15-19 | 92 20-24 | 509 25-29 | 1635 30-34 | 2833 35-39 | 1842 40-44 | 383 45-54 | 118 (a) Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother 30 to 39 years old. P(30 to 39) = (Type an integer or decimal rounded to three decimal places as needed.) (b) Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was not 30 to 39 years old. P(not 30 to 39) = (Type an integer or decimal rounded to three decimal places as needed.) (c) Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was less than 45 years old. P(less than 45) = (Type an integer or decimal rounded to three decimal places as needed.) (d) Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was at least 40 years old. Interpret this result. Is it unusual? Find the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was at least 40 years old. P(at least 40) = (Type an integer or decimal rounded to three decimal places as needed.) Interpret this result. Select the correct choice below and fill in the answer box to complete your choice. (Type a whole number.)
Use the provided histogram to answer questions about the number of births for each age group. How many births occurred among women under the age of 20? number of births: 392000 What percentage of births occurred among women between the ages of 36 and 38? Give your answer to one decimal place. percentage of births: 11.2
Adi S.
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