13. Johnson et al. (A-16) performed a retrospective review of 50 fetuses that underwent open fetal myelomeningocele closure. The data below show the gestational age in weeks of the 50 fetuses undergoing the procedure.

25 25 26 27 29 29 29 30 30 31 32 32 52 33 33 33 33 34 34 84 85 35 35 35 35 35 35 35 35 36 36 36 36 36 36 36 36 36 36 36 36 36 36 37 37 36 36 36 36 36 SOURCE: Mark P. Johnson, Leslie N. Sutton, Natalie Rintoul, Timothy M. Crombleholme, Alan W. Flake, Lori J. Howell, Holly L. Hedrick, R. Douglas Wilson, and N. Scout Adzick, Tetal Myelomeningocele Repair: Short-term Clinical Outcomes," American Journal of Obstetrics and Gynecology, 189 (2003), 482-487.

(a) Construct a stem-and-leaf plot for these gestation

(b) Based on the stem-and-leaf plot, what one word would you use to describe the nature of the data?

(e) Why do you think the stem-and-leaf plot looks the way it does?

(d) Compute the mean, median, variance, and standard deviation.

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(a) Construct a stem-and-leaf plot for these gestation (b) Based on the stem-and-leaf plot, what one word would you use to describe the nature of the data? (e) Why do you think the stem-and-leaf plot looks the way it does? (d) Compute the mean, median, variance, and standard deviation. 14. The following table gives the age distribution for the number of deaths in New York State due to accidents for residents age 25 and older. Age (years) Number of Deaths Due to Accidents 15. 25-34 393 35-44 514 45-54 460 55-64 341 65-24 365 75-84 616 85-94* 618 SOURCE: New York State Department of Health, Vital Statistics of New York State, 2000, Table 32: Death Summary Inform tion by Age. *May include deaths due to accident for adults over age 94. For these data construct a cumulative frequency distribution, a relative frequency distri budon, and a cumulative relative frequency distribution. Krieser et al. (A-17) examined glomerular filtration rate (GFR) in pediatric renal transplant recipients. GFR is an important parameter of renal function assessed in renal transplant recipients. The following are measurements from 19 subjects of GFR measured with dieth- ylenetriamine penta-acetic acid. (Note: some subjects were measured more than once.)