TABLE 6–11 Actual Sales Data Solution to Problem 6 W1 = 3 W2 = 5 W3 = 9 Actual Sales Forecast Weighted Moving Average Absolute Time Period ($00) Deviation 445 478 525 660 570 600 632 648 690 725 1 2 162.94 18.18 11.47 30.24 4. 497.06 588.18 588.53 601.76 611.65 634.82 667.41 701.12 732.06 36.35 55.18 10 11 12 57.59 48.88 750 Sum 420.82 in MAD = 52.60
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.
Using the data in Table 6–11, answer the following:
a. What is the slope?
b. What is the intercept?
c. Write the regression equation.
d. Calculate a regression forecast for month 25.
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