Posted: November 26th, 2016
Is there enough statistical evidence to support the investigator’s claim that the prevalence of cord blood lead level of ≥10μg/dL is significantly different in newborns of working mothers compared to newborns of housewives?
- The WHO reported back in 2009 that a cord blood lead level of ≥10μg/dL can be related to poor neuropsychological development of children. In the presented data set, there is a noticeable difference in the concentration of cord blood lead between newborns of working and those of non-working mothers (as observed in the table below).
| cord blood lead level of ≥10μg/dL | cord blood lead level of <10μg/dL | |
| Housewives | 3 | 9 |
| Working Mothers | 10 | 4 |
Looking at this table, an investigator hypothesizes that the prevalence of cord blood lead level of ≥10μg/dL is significantly higher in newborns of working mothers compared to that in newborns of housewives. He collects a large sample of 240 pregnant women, 120 working and 120 housewives; and examines the cord blood of their newborns for lead concentration. His results are presented in the below table:
| cord blood lead level of ≥10μg/dL | cord blood lead level of <10μg/dL | |
| Housewives | 38 | 82 |
| Working Mothers | 67 | 53 |
- Is there enough statistical evidence to support the investigator’s claim that the prevalence of cord blood lead level of ≥10μg/dL is significantly different in newborns of working mothers compared to newborns of housewives?
- Is it possible to use the data provided in the current sample of 26 women to test the investigator’s claim? Please, justify your answer.
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