Question

Weight change of twelve rats after being subjected to a regimen of forced exercise. Each weight change (in gram) is the weight after exercise minus the weight before: 1.7, 0.7, -0.4, -1.8, 0.2, 0.9, -1.2, -0.9, -1.8, -1.4, -1.8, and -2.0.
(Question) Test the hypothesis that the exercise does not cause weight change.

1. H0: mean = 0 and HA: mean ? 0 (depending on the questions been asked)

2. UseOnesamplet-test(twotailed)

3. Teststatistict=-1.81,degreesoffreedom=n-1=11

4. P-value=0.098

5. Sincep-valueisgreaterthanalpha=0.05,wefailtorejectthenullhypothesis(orwe do not reject the null hypothesis)

6. Weconcludethattheexercisedoesnotcauseaweightchangeinthepopulationfrom which this sample came.

Answer 1

The correct conclusion based on p - value is:

Since p - value is greater than 0.05, we fail to reject the null hypothesis. Hence,

We do not have sufficient evidence to reject the claim that the exercise does not cause weight change.