Rahim is trying to decide if regular mentally stimulation activities help delay when an elderly person gets dementia. He gathered data from two large nursing home facilities. The residents in Hifalutin Garden have regular mentally stimulation activities. The residents in Pretentious Terrace do not have regular mentally stimulating activities. The age data on when patients began showing signs of dementia from his survey is below. Based on the data, what can we say about the effect of regular mental stimulation activities and the onset of dementia?

Hifalutin Garden: 83,75,70,75,78,88,102,100,92,99

Pretentious Terrace: 60,68,69,79,73,70,55,81,68,71