A global study was conducted on 70 - 79 year old males from various countries around the world. 44 randomly selected men from Beijing, China hadan average height of 1.61 meters with a known standard deviation of 0.04. Similarly, 180 randomly selected men from Tianjin, China hadan average height of 1.66 meters with aknown standard deviation of 0.06.

Is there enough evidence, at a =0.01 level of significance, to show men from Beijing are shorter, on average, than men from Tianjin?

Find the test statistic. Round to the nearest hundredth.

Provide your answer below:

Test statistic =