The article entitled "Effect of metformin therapy on 2-h post-glucose insulin levels in patients of polycystic ovarian syndrome" by Saxena et al. discussed the influence of metformin on insulin levels in women with polycystic ovarian syndrome (POCS).

Summarize the article in terms of the statistics that were used and calculate the following statistics for i) the body mass index, ii) the FSH levels, and iii) the mean hirsutism scores (15 points):

Statisitcs were summarized in the table below, I am confused where to start for the next two parts.

a. The 95% and 99% confidence intervals.

b. Test the null and alternative hypothesis that the after treatment results are significantly different from the before treatment results.