Could someone help me solve this problem, I don't understand how to raise the hypotheses (null and alternative), they ask me to solve this problem by "Signed range test for two means"

2. It is claimed that a new diet will reduce a person's weight by 4.5 kilograms, on average, over a two-week period. The weights of 10 women who follow this diet are recorded, before and after a period of two weeks, and the following data are obtained:

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