One method for measuring air pollution is to measure the concentration of nitrogen dioxide, or $NO_2$, in the air. Suppose Nina,
an environmental scientist, wishes to estimate the $NO_2$ concentration in Budapest, Hungary. She randomly selects 42 locations
throughout the city and measures the $NO_2$ concentration at each location. Based on her 42 samples, she computes the margin of
error for a 95% t-confidence interval for the mean concentration of $NO_2$ in Budapest, in $\mu g/m^3$, to be 3.17.
What would happen to the margin of error if
Nina decreases the confidence level to 90%?
Nina increases the confidence level to 99%?
Nina decreases the sample size to 37 locations?
Nina increases the sample size to 60 locations?
Answer Bank
Decrease