One method for measuring air pollution is to measure the concentration of particulate matter having a diameter less than 10 microns, or PM10, in the air. Suppose Nina, an environmental scientist, wishes to estimate the PM10 concentration in Brussels, Belgium. She randomly selects 40 locations throughout the city measures the PM10 concentration at each location. @ Macmillan Learning Based on her 40 samples, she computes the margin of error for a 95% t-confidence interval for the mean concentration of PM10 in Brussels, in ug/m', to be 1.34. What would happen to the margin of error if Nina increases the confidence level to 99%? Nina decreases the sample size to 31 locations? DOC Nina increases the sample size to 55 locations? Answer Bank Decrease Increase Stay the same