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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 [email protected] 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