a. Explain what the trend shows. Choose the correct answer below.     A. Approximately 47​% of the people in Country A smoke.   B. Approximately 47​% of the people in Country A do not smoke.   C. The lower the percentage of​ smoke-free homes in a​ region, the lower the percentage of high school students who smoke tends to be.   D. The higher the percentage of​ smoke-free homes in a​ region, the lower the percentage of high school students who smoke tends to be. Your answer is correct. b. Use the regression equation to predict the percentage of students in high school who​ smoke, assuming that there are​ 70% smoke-free homes in the region. Use 70 not 0.70.   nothing​% ​(Round to the nearest integer as​ needed.)

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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.