BIO361H5 Lecture 2: Lec 2 - Sept 11
Document Summary
Identify study design (observational, experimental: formulate hypothesis (null and alternative hypothesis, create descriptive summary (graph, numerical analysis, decide on analysis technique. Look at type of data (quantitative or categorical, continuous variable) Figure out what test to do based on the data. Two sample t-test is another way of the anova test (just using 2 levels) Whiskers = 1. 5 x interquartile range, min and max, can determine outliers from these. The box lines = interquartile range = 25% of the data above and below. Diet has an effect on eye stalk, the ones fed with corn has higher eye stalk and the ones fed with cotton have lower eye stalk. Box plots should be symmetrical at the median, and boxes should be the same size for groups to be compared. p-value < 0. 05, thus the null hypothesis is rejected. Thus there is a significant difference between eyespan due to diet. Null = true difference in means is not equal to 0.
