Online shopping. Online shopping statistics are routinely reported by www. shop. org. Of interest to many online retailers are gender-based differences in shopping preferences and behaviors. The average monthly online expenditures are reported for males and females: Male Female n 45 45 Mean $350 $310 Standard deviation $95 $80 You suspect that male shoppers are spending more than the female shoppers. Which among the following test should you use? Group of answer choices

two sample z test
two sample pooled-t test (equal population standard deviation)
two sample t test with unequal population
standard deviation paired t test