Based on the Stata output below concerning lowest pH score (lowph) and delivery

Question

Based on the Stata output below concerning lowest pH score (lowph) and delivery method (delivery) of VLBW infants, which of the following is true?

a. There is not a significant difference in mean lowest pH between vaginal and abdominal deliveries.

b. There is a significant difference in delivery method for infants with a lowest pH score less than 7.

c. The 95% confidence interval for lowest pH score among abdominal deliveries is (7.21, 7.25).

d. The sample size for this dataset is 172.

. ttest lowph, by (delivery) level (90) Two-sample t test with equal variances Group obs Mean Std. Err. Std. Dev. [90% Conf. Interval] 103 71 7.227765 7.24654 .1076298 7.210161 7.245369 1364288 7.219065 7.273044 abdomina .0106051 0161911 vaginal combined 174 7.235228 0091106 .1201767 7.220162 7.250294 diff -.0182893 0185388 -.048948 0123694 -mean(abdomina) -mean(vaginal) diff Ho: diff 0 t= -0.9865 degrees of freedom 172 Ha: diff t) = 0.8374 Ha: diff != 0 Pr(ITI > tl)0.3253

Explanation / Answer

Considering the data that has been given below and looking at the critical values and the t test, the correct answer would be: -

b. There is a significant difference in delivery method for infants with a lowest pH score less than 7.

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