It is known that a 6 month old golden retriever dog gains an average of 1.4 kg per month with a standard deviation of 180 g. A special high protein diet is given to 50 randomly selected 6 month old dogs; their average weight gain in one month was 1.47 kg with a standard deviation of 140 g. Your friend John thinks that this diet is not effective, and you want to test whether John is right or not. What would be the alternative hypothesis in this hypothesis test?