Ecologists mapped a large Canadian forest plot dominated the Douglas fir, with an understory of western hemlock and western red cedar. The two-way table below records all 2,050 trees in the plot by species and life stage. Sapling trees (young trees shorter than 1.3 meters) are indicative of the future of the forest. Test the relationship between species and life stage. - When calculating the Chi-square statistic, each cell of the table makes a contribution to the total. What contribution do western red cedar saplings make? (The sum of all contributions resulted in a Chi-square statistic of 420.21) Can you explain this with table of expected counts like dead, live, sapling of western red cedar/douglas fir/western hemlock?
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
Ecologists mapped a large Canadian forest plot dominated the Douglas fir, with an understory of western hemlock and western red cedar. The two-way table below records all 2,050 trees in the plot by species and life stage. Sapling trees (young trees shorter than 1.3 meters) are indicative of the future of the forest. Test the relationship between species and life stage.
- When calculating the Chi-square statistic, each cell of the table makes a contribution to the total. What contribution do western red cedar saplings make?
(The sum of all contributions resulted in a Chi-square statistic of 420.21)
Can you explain this with table of expected counts like dead, live, sapling of western red cedar/douglas fir/western hemlock?
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