Lecture/text homework assignment # 10 Note: Please circle your answers when appropriate! Some of these problems are one sided, some are two sided - you'll have to figure out which is which. 1) Malaria is a disease that destroys red blood cells (the parasite invades red blood cells, multiplies, and then infects more red blood cells). In a recent study (Kotepul, et al., 2015) looking at various blood counts, the authors found the following results. Results are in billion red blood cells / cubic mm. Note that I have deliberately modified these results (do not use R): n y s Low infection 527 4.16 2.23 High infection 157 4.51 2.34 Is there a difference in red blood cell count? (Hint: please think about this before you just start working on the problem!)

I can't tell how to determine whether to use one sided or two sided tests. How would I go about figuring this out and how does it effect my calculations?