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Time of Birth, Sex, and Birth Weight of 44 Babies

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 dunn@usq.edu.au

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