Refer to the Luisa Crimini company information in Exercise 3-28.

Required:

Prepare a scattergraph based on Luisa’s data. Use cost for the vertical axis and number of tanning appointments for the horizontal. Based on an examination of the scattergraph, does there appear to be a linear relationship between the cost of tanning services and the number of appointments? 

Data From Exercise 3-28:

Luisa Crimini has been operating a beauty shop in a college town for the past 10 years. Recently, Luisa rented space next to her shop and opened a tanning salon. She anticipated that the costs for the tanning service would primarily be fixed but found that tanning salon costs increased with the number of appointments. Costs for this service over  the past eight months are as follows:

Required:
  1.  Which month represents the high point? The low point?
  2.  Using the high-low method, compute the variable rate for tanning. Compute the fixed cost per month.
  3.  Using your answers to Requirement 2, write the cost formula for tanning services.
  4.  Calculate the total predicted cost of tanning services for September for 2,500 appointments using the formula found in Requirement 3. Of that total cost, how much is the total fixed cost for September? How much is the total predicted variable cost for September?