# Statistics: Analysis of a Scatterplot

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Please view the diagram in the attached file.

4. The following scatterplot shows the increase in Halloween candy sales (in millions of dollars) over a 7-year period.

Simple linear regression results:

Dependent Variable: Candy Sales

Independent Variable: Year

Candy Sales = -178.09921 + 0.090035714 Year

Sample size: 7

R (correlation coefficient) = 0.9875

R-sq = 0.9752395

Estimate of error standard deviation: 0.03394944

Parameter estimates:

Parameter Estimate

Intercept -178.09921

Slope 0.090035714

a. Looking at the scatterplot of the data, what does it tell you about the relationship between the year and the amount of candy sales?

b. Find the equation of the least squares line of regression.

c. What does the correlation coefficient tell you about the relationship between the year and the amount of candy sales?

d. Predict the amount of sales for 2002.

e. Are you confident that predictions based on the equation of the least squares line of regression will be quite accurate? Why or why not?

f. What percent of the variation in the amount of candy sales can be explained by the regression on (relationship with) the year?

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##### Solution Summary

Statistical analysis of a scatterplot is provided. Simple linear regression results are provided.

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a. There is a strong positive correlation between the two variables.

b. If year and candy sales are designated as x and y respectively, we could have the following equation: ...

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