Which measure of central tendency is least affected by extreme values (outliers)?

How many variables doe a Chi-square goodness of fit test look at?

The purpose of the gel in SST tubes is to:

Coagulation tests such as PT and PTT are performed on which tube?  

What is the additive in green tubes?

1763071370802-264bbd69-9e2b-49d9-bff8-34c2f98a1667_21.jpg

1763071370802-264bbd69-9e2b-49d9-bff8-34c2f98a1667_29.jpg

1763071370802-264bbd69-9e2b-49d9-bff8-34c2f98a1667_23.jpg

1763071370802-264bbd69-9e2b-49d9-bff8-34c2f98a1667_5.jpg

If CSF has a xanthochromic appearance, when can bleeding be seen?