Consider the data taken from a study attempting to determine whether the use of electronic fetal monitoring (EFM) during labor affects the frequency of cesarean section deliveries. Of the 5824 infants included in the study, 2850 were electronically monitored and 2974 were not. The outcomes are given in Table E4.11.
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TABLE E4.11
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EFM Exposure
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Cesarean Delivery
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Yes
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No
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Total
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Yes
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358
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229
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587
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No
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2492
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2745
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5237
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Total
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2850
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2974
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5824
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(a) Use the data from the group without EFM exposure, calculate the 95% confidence interval for the proportion of cesarean delivery.
(b) Calculate the 95% confidence interval for the odds ratio representing the relationship between EFM exposure and cesarean delivery.