Bio150statsintro

# Bio150statsintro - Statistics lecture Why do we need...

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Statistics lecture Why do we need statistics to tell us if plant type (wt or jar1) influenced how much caterpillars ate? (Because there is a lot variation, and we need to know how much can be accounted for by the type of plant the caterpillars ate) Fictitious data set: A group of 30 patients are in study to test how well 2 medications do at lowering blood pressure. To get into the study, a patient had to have a systolic (the one on the top) blood pressure of 165. The patients were split into 3 groups: 10 on medication A; 10 on medication B; 10 given a placebo medication. After 5 days, their blood pressures were measured again. Here is the outcome: Medication Number Mean A 10 142.700 B 10 146.500 None 10 170.300 These are some descriptive statistics concerning our data. These are also called summary statistics. First we have N or the number of observations. Then we have a measure of central tendency = mean or median . So, looking at these means, it looks like medication A helps more than medication B and that both are much better than no medication at all. But here are the data plotted.

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SBP vs. Medication
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