A researcher would like to find out if there is any association between age(in four age groups) and the choice of smartphones brand (with three brand). A random sample of 500 new smartphone buyer in Metro Vancouver was drawn. Suppose chi-square statistic is calculated to be 18.6. Can we conclude that new smartphone buyers at different groups have a significantly different preference in their choice of smartphone brand? Make sure you use the three-step process and an appropriate decision point to answer this question.