I have two data sets, where sulfate concentrations of groundwater in a specific site are shown for two different years
2013 data is not normally distributed (tested using Shapiro-Wilk normality test p value is 0.003. 2014 data is normally distributed (p-value = 0.26). Used R software.
Can I log transform both data sets to get a normal distribution for both groups so I can conduct a two sample welch test? Also, will I have to back-calculate the p-value resultant from log-transformed t-test?