Hi guys, hope you all had a good weekend.

I am wanting to analyse the effectiveness of a promotion on the amount of money that was spent in shops by specific customers every day.

If I have on a daily basis, say, a customer's turnover per day before the promotion started - and the daily turnover of the same customer per day after the promotion started - what is the best statistical method I can use to determine whether the promotion had a significant uplift on the turnover of a customer?

I am thinking a t-test on an unpaired sample set but I wasn't sure if this was the best way.

Any help would be much appreciated.

Thanks,

Fernando.