Hello, what you need is to use compare means for the groups before and after visiting your website, I can do this + create a manual in excel or spss (statistical software package) to show you how to run it in future+ provide scientific proof for you to support your finding and my price is for all mentioned services. Also more about me:
I am m.s of systems engineering and b.s of industrial engineering and I have passed many related courses such as mathematics, probability, data analysis and statistics that statistics is the base of my major, confidence interval (that I made a spreadsheet for it too), analysis of variance, regression (that I passed also econometric that is advanced regression), I can do MANOVA analysis, Hypothesis tests (compare means, variances, correlations..), descriptive analysis, cross-tabulation and… that are ordinary task in statistical analysis, I analyzed many types of questionnaires here including nominal, ordinal, scale and also open-end questions, I have good command of English too).