HELLPP!

Ning is trying to budget her company's sales for the upcoming year using a model based on past data, She believes the company's marketing expenditures should help explain sales, as should the number of units sold and the number of salespeople working After gathering data for all of these variables, she generated a single regression model for each possible cost driver, as follows. Marketing Expenditures R-Square 0.5968 Number of Units Sold R-Square 0.3601 Number of Salespeople R-Square 0.0111 Are anv of these possibie sindle rezression models vatid? Marketingemenditures Number of units sold Number of saie upecgle