Exercises Activated T cells Mice weight

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Presentation transcript:

Exercises Activated T cells Mice weight Providing the observed difference between WT and KO cells is of scientific interest, what sample size is needed to achieve a 80% power? Mice weight What sample size is needed to be able to spot a 10% difference with 80% power?

Exercises Arachnophobia Cane toad Neutrophils Is it as scary to look at the picture of a spider than at a real one? Cane toad Is the proportion of cane toads infected by intestinal parasites the same in 3 different areas of Queensland? Neutrophils Is there a difference between KO with/without treatment and WT?

Activated T cells Answer: To achieve a power of 80%, you will need a total sample of 288 cells.

Mice weight Answer: To be able to spot a 10% difference in the mice weight, at 80% power, you will need a sample n=7.

Arachnophobia Answer: If you are arachnophobe, it is scarier to look at a real spider than at the picture of one (p=0.0310).

Cane toad Answer: The proportion of cane toads infected by intestinal parasites varies significantly between the 3 different areas of Queensland (p=0.0015), the animals being more likely to be parasitized in Rockhampton and Mackay than in Bowen.

Neutrophils Answer: There is a significant difference from WT for the first and third groups.