t is required to know if the air pollution measured by micrograms per cubic meter are different this year, with respect to the previous year on a given day, for four regions of the country. With the information in the following table, calculate the Chi-square statistic and determine if the frequencies are different according to this test and a significance level of 0.05.

REGION	EXPECTED FREQUENCIES	OBSERVED FREQUENCIES
North	112	90
South	120	130
East	80	62
West	60	68

Question 5 options:

0.0712; not different

0.0032 not different

0.0032; are different

0.0712; are different