3. A personal trainer claims that their exercise programme will lead to a re- duction in weight. The weight in kg of each of 10 participants was measured before and after the programme, denoted X; and Y, respectively. Let D; be the difference Dị = Xi – Yị. The following information is available: EDi = -31.71 and D; = 120.358. (a) Carry out an appropriate test on the Personal Trainer's claim.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.