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babyboom.dat
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NAME: Time of Birth, Sex, and Birth Weight of 44 Babies
TYPE: Observational
SIZE: 44 observations, 4 variables
DESCRIPTIVE ABSTRACT:
The dataset contains the time of birth, sex, and birth weight for each
of 44 babies born in one 24-hour period at a Brisbane, Australia,
hospital. Also included is the number of minutes since midnight for
each birth.
SOURCE:
The data appeared in the Brisbane newspaper _The Sunday Mail_ on
December 21, 1997.
VARIABLE DESCRIPTIONS:
Columns
1 - 8 Time of birth recorded on the 24-hour clock
9 - 16 Sex of the child (1 = girl, 2 = boy)
17 - 24 Birth weight in grams
25 - 32 Number of minutes after midnight of each birth
Values are aligned and delimited by blanks. There are no missing
values.
STORY BEHIND THE DATA:
Forty-four babies -- a new record -- were born in one 24-hour period at
the Mater Mothers' Hospital in Brisbane, Queensland, Australia, on
December 18, 1997. For each of the 44 babies, _The Sunday Mail_
recorded the time of birth, the sex of the child, and the birth weight
in grams.
Additional information about these data can be found in the "Datasets
and Stories" article "A Simple Dataset for Demonstrating Common
Distributions" in the _Journal of Statistics Education_ (Dunn 1999).
PEDAGOGICAL NOTES:
The data can be used to demonstrate fitting the binomial distribution
(the number of boys/girls born out of 44 births), the geometric
distribution (the number of births until a boy/girl is born), the
Poisson distribution (births per hour for each hour), and the
exponential distribution (times between births). The normal
distribution is found to be unsuitable for modeling the birth weights,
but better results are obtained when birth weights are separated by
sex. The dataset can also be used to illustrate hypothesis tests about
proportions, comparisons of birth weights by gender, the runs test of
randomness of gender, and skewed data.
REFERENCE:
Steele, S. (December 21, 1997), "Babies by the Dozen for Christmas:
24-Hour Baby Boom," _The Sunday Mail_ (Brisbane), p. 7.
SUBMITTED BY:
Peter K. Dunn
Department of Mathematics and Computing
University of Southern Queensland
Toowoomba, Queensland, Australia 4350
START DATA:
0005 1 3837 5
0104 1 3334 64
0118 2 3554 78
0155 2 3838 115
0257 2 3625 177
0405 1 2208 245
0407 1 1745 247
0422 2 2846 262
0431 2 3166 271
0708 2 3520 428
0735 2 3380 455
0812 2 3294 492
0814 1 2576 494
0909 1 3208 549
1035 2 3521 635
1049 1 3746 649
1053 1 3523 653
1133 2 2902 693
1209 2 2635 729
1256 2 3920 776
1305 2 3690 785
1406 1 3430 846
1407 1 3480 847
1433 1 3116 873
1446 1 3428 886
1514 2 3783 914
1631 2 3345 991
1657 2 3034 1017
1742 1 2184 1062
1807 2 3300 1087
1825 1 2383 1105
1854 2 3428 1134
1909 2 4162 1149
1947 2 3630 1187
1949 2 3406 1189
1951 2 3402 1191
2010 1 3500 1210
2037 2 3736 1237
2051 2 3370 1251
2104 2 2121 1264
2123 2 3150 1283
2217 1 3866 1337
2327 1 3542 1407
2355 1 3278 1435