BIOL 1020 Lecture Notes - Lecture 4: Bar Chart, Design Of Experiments, Common Cold
15 Mar 2016
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Document Summary
Hypotheses: a high stress level increases suscepibility to colds. Results of correlaive study: the number of colds increases as stress levels increase. Results: the number of colds increases as stress levels increase. The correlaion might be due to other reasons. Staisics can help us evaluate and compare data. Mean (average) sum of hair lengths divided by # of measurements. Not taking a large enough sample is a standard error (when they are wide apart) Standard error of the mean: is the probability that the populaion mean will fall in the calculates interval (usually 95%) Indicate whether results from sample may extend to enire populaion. If an experiment was designed and carried out properly. If observer error occurred; can evaluate only the probability of sampling error. If the result is of any biological signiicance. Example: observer error likely if person reads muli-parameter urine tests. Common belief: ulcers are caused by acids and spicy food.
