A diet programme aims at trying to help people lose at least 2 kg in weight within five weeks of starting the programme. A sample of eight participants are asked to volunteer to take part in the experiment and their weight at the beginning of the programme and after five weeks is measured and recorded. The following estimators were calculated: d̅ = 2.225; s²_d = 0.931589. Test, at the 5% significance level, the claim that participants will lose at least 2 kg of weight within the first five weeks of the programme, assuming the weight losses are normally distributed.