BIOSC-101 Lecture Notes - Lecture 29: Soil Ph, Statistical Inference, Test Statistic
21 Dec 2020
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Ho: null hypothesis no difference between groups due to treatment. Steps: define ho, ha, calculate test statistic (t-statistic, x2 value, etc. , obtain critical value (t-critical or x2 critical) Use to compare the means of 2 groups (groups are independent) Calculate and interpret results of a two-sample t-test. Consider factors influencing good (vs. poor) experimental designs. Soil ph influences plant height. ph is the independent variable, height is the dependent. Prediction: lower ph will lead to shorter plant height. Statistics- two-sample t-test: ho: no significant difference in mean plant height between soil ph treatments (acidic ph, neutral ph) *ho always says there"s nothing going on, no difference between: ha: significant difference in mean plant height between soil ph treatments. *we did descriptive statistics already and graphed our data looked at trends. Acidic soil ph mean= 5 cm, s = 2. 24 cm, n= 5.
