Answer All Questions Essay Example | Topics and Well Written Essays - 1750 words

Answer All Questions - Essay Example 150). In a scatter plot diagram, the more two variables are highly correlated; the data points would cluster closer around an imaginary line. For perfect correlation, the data points fall on the straight line. b. A very strong correlation: The degree of relationship between two variables is measured by the correlation coefficient. The stronger the relationship between the variables, the closer the coefficient would move to either +1.00 or -1.00. When the measure of correlation moves closer to either of these two values, it is said that a very strong correlation exists between the two variables. c. Null correlation: Two variables are aid to have null correlation is there is no correlation between them. This happens in case of comparing two variables that are not at all related to one another. The correlation coefficient is 0.90 approximately. The variables under consideration are sales and advertisement. The value of correlation is 0.90 which implies that there exists a strong positive correlation between the variables. The result shows that the advertising made by the company has a positive effect on its sales. The sales are boosted owing to the advertisement. iii) a. The regression model is a multiple regression model and has four independent variables. The dependent variable is the number of copies sold. The only significant value obtained is between the number of pages and the number of copies sold, which is 0.13