BISC104 Chapter Notes - Chapter 1: Descriptive Research, Scientific Method, Sample Size Determination
10 Sep 2018
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Hypothesis: proposed explanation for a single observation. Found bacteria in the stomach of their patients. Marshall drank bacteria to prove his hypothesis. Found helicobacter pylori: leading cause of ulcers. Dependent variable - the outcome of the independent variable. Placebo- fake independent variable (ex- sugar pill) Avoid bias- opinions should not be taken into account. Blind experiment - subject does not know what group they are in. Double blind experiment - subject and experimenters don"t know which group is which. Hen humans are not an option- sometimes use animas. Using correlation to test hypotheses ex stress and common cold. Sampling error - difference between sample and population. Standard error of the mean - measure of variability in sample. Statistically significant- an observed difference is probably not due to sampling error. True mean= mean +/- standard error (chance) No overlap means there is a sig difference. Confidence interval - standard error of the mean: range of values from a sample that has.
