Anyone got any hints on how to do the questions below?
A study was conduced in Scotland in 2005 to determine if there was evidence to suggest that folic acid should be added to bread, or if there may be an alternative solution.
Data were recorded on the use of folic acid supplements in pregnancy from 233 women. The results are shown in Table 1 and displayed in Figure 1. The data shown in Figure 1 are obviously categorical, with each woman having taken folic acid periconceptually (i.e. correct use - prior to conception), incorrectly (i.e. only after conception) or not at all.
Based on data from the US it was thought that the proportions of women using folic acid supplements correctly would be about 35%, incorrectly about 25% and not at all 40%.