Johnson et al. (A-16) performed a retrospective review of 50 fetuses that underw

Question

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 32 33 33 33 33 34 34 34 35 35 35 35 35 35 35 35 35 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 36 37 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. Scott Adzick, "Fetal 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 gestational ages. (b) Based on the stem-and-leaf plot, what one word would you use to describe the nature of the data? (c) Why do you think the stem-and-leaf plot looks the way it does? (d) Compute the mean, median, variance, and standard deviation.

Explanation / Answer

SOlution:-

a)

Stem       Leaf

2           5 5 6 7 9 9 9

3         0 0 1 2 2 2 3 3 3 3 4 4 4 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 7

b) The data is left skewed.

c) The stem and leaf plot looks like this beacuse the most of the ponts lie in the right handside of the distribution.

d)
Basic Statistics:
Minimum: 25

Maximum: 37

Count: 50

Sum: 1684

Mean: 33.68

Median: 35

Mode: 36

Standard Deviation: 3.21

Variance: 10.3

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