Association between maternal age and birth weight

Reference no: EM13109220

A small pilot study is being conducted to determine the association between maternal age and birth weight.

First, from all the single births in 2009 at Hospital X with mothers aged ? 20 years, we randomly selected 15 records. We also selected randomly 17 records from all the single births with mothers aged > 20 years. Then we classified each newborn as weighting ? 2500 grams or > 2500 grams.

The data is summarized in the table below:

	Birth weight
Mother's age	? 2500 grams	> 2500 grams	Total
? 20 years	5	10	15
> 20 years	4	13	17
Total	9	23	32

a) State the relevant null and alternative hypotheses.

b) Using a type I error level of 0.05, perform the appropriate statistical test.

c) Explain your results in 2-3 sentences.

d) If we extended the study and randomly selected 230 records from all the single births in 2009 at Hospital X (the data is shown below), would the maternal age be related to the birth-weight of the infant? Conduct test of hypothesis. Interpret the results.

	Birth weight
Mother's age	? 2500 grams	> 2500 grams	Total
? 20 years	40	60	100
> 20 years	34	96	130
Total	74	156	230

Reference no: EM13109220

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