Question: The cost of a leading liquid laundry detergent in different sizes is given in Table 12.31 .

Table 12.31

1. Using "size" as the independent variable and "cost" as the dependent variable, draw a scatter plot.
   
2. Does it appear from inspection that there is a relationship between the variables? Why or why not?
   
   c. Calculate the least-squares line. Put the equation in the form of: ŷ = a + bx
   
   d. Find the correlation coefficient. Is it significant?
   
   e. If the laundry detergent were sold in a 40-ounce size, find the estimated cost.
   
   f. If the laundry detergent were sold in a 90-ounce size, find the estimated cost.
   
   g. Does it appear that a line is the best way to fit the data? Why or why not?
   
   h. Are there any outliers in the given data?
   1. Is the least-squares line valid for predicting what a 300-ounce size of the laundry detergent would you cost? Why or why not?

j. What is the slope of the least-squares (best-fit) line? Interpret the slope.

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