A sample of annual wages across 31 individuals from Canada had a sample mean of $35,000 with sample variance of 100,000. A similar random sample of 31 individuals for the USA had a sample mean of $40,340 with sample variance of 121,000. Assume wages in both countries are distributed chi-squared. If you want to test that the true annual average wage in Canada might be different from the USA what type of test will you perform? A difference of dependent means B difference of independent means with known variance C difference of independent means with unknown unequal variance D difference of variances E difference of independent means with unknown equal variance