A pressure group has been monitoring the percentages of monthly donation to charitable organization in HK. It is suspected that the percentage of monthly donation of donors who are in the age group of 25?35 years old has been dropping. Over the years, the percentage of donation generated from this age group bas been 27%. A random sample of 100 donors of 25-35 years old was selected. It is found that the percentage of monthly donation for charitable organization in this sample is 24%. Is there enough evidence to conclude that the percentage of monthly donation of 25-35 years old donors in HK has been decreasing? Assuming a 5% significance level is used.