Answer the questions in Exercise 8.26, this time using early neonatal death rates per 1,000 births.

Exercise 8.26

A study [9] of 173,524 births in Sweden between 1983 and 1987 used the data in Table 8.8 on late fetal deaths (stillbirth at a gestation of 28 weeks or longer) and early neonatal deaths (during the first 6 days of life). Convert the late fetal death data to rates per 1,000 births by dividing the total number of late fetal deaths by the number of births and multiplying the result by 1,000.

a. Draw a scatter diagram using your calculated death rates and the maternal-age midpoint (22.5, 27.5, 32.5, 37.5, and 46.5). Which is your dependent variable?

b. Use least squares to estimate the regression model Y = α + βX + ε.

c. What is the two-sided P value for the slope?

d. What is a 95 percent confidence interval for the slope?

e. Explain why the estimated value of the slope does or does not seem substantial.

Transcribed Image Text:

Maternal Age Births Late Fetal Deaths Early Neonatal Deaths 20-24 70,557 251 212 25-29 68,846 253 177 30-34 26,241 125 78 35-39 6,811 34 33 40-52 1,069 7 5