Your colleague ran a linear regression analysis to understand the effect of vouchers on the 1st visit on the total number of sessions (the training data was consolidated on a user level, with voucher = binary variable, with values 0/1 and target variable = the total number of orders during the entire a lifetime of each user). The results showed an R2 = 0.6 and the estimated coefficient for the voucher was 5.

He needs help interpreting these results and checks in with you before presenting the results to the shareholders. What would you advise?