Question: A population estimate of blood creatinine levels is made in a group of pregnant women, obtaining the following results: mean (×) 0.8 mg / dL; typical deviation (s) 0.62 mg / dL; sample size (n) 85 women. According to the previous data, the confidence interval for the population mean (μ) with a confidence level of 95% (Z = 1.96) is: 
 Options:  <1> 0.8 ± 0.04. <2> 0.8 ± 0.13. <3> 0.8 ± 0.62. <4> 0.8 ± 1.96. <5> 0.8 ± 0.07.
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