I have 2 sets of brand preference data (in %) to measure impact of online advertising on target group F20-40 years i.e., 1.different time period (pre/post – not same consumers but same target group) & 2. Control (not seen online advertising) vs Exposed (exposed to advertising). Could you suggest what statistical significance test I should use and why?

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#### Best Answer

If you assume that the preference is a normally distributed random variable, you can use a two sample t-test. It will test whether the null hypothesis that data from two groups are independent random samples from normal distributions with equal means and equal but unknown variances, against the alternative that the means are not equal.

You can use `ttest2`

in MATLAB.

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