Marcharpex is a company selling specialized software products to a select number of manufacturing companies. The company relies on senior salespeople to make contacts, sell the product, and provide a company contact for after-sales support. The company is wondering if its sales model is effective, and it has collected some data on
• The years of experience of the salesperson
• The monthly travel and entertainment budget of the salesperson
• The local advertising budget (monthly) for the salesperson's area
• The sales in the area
Analyze the data, and select the best model to predict sales. Be sure to check the required conditions. Once you select the best model, create a 95% prediction interval (approximate) of the sales for a salesperson who has 15 years of experience, a monthly travel and entertainment budget of $2,000, and a local advertising budget of $4,000.