The following table shows the cost, in millions of dollars, to a certain company of adding the given number of employees to each of its superstores. E = number of new employees 1 2 3 4 C = cost 69.8 139.6 209.4 279.2 (a) Find a linear model for the data in the table. C(E) =

In simple linear regression:  a. The size of the coefficient for each IV gives you the size of the effect that varilable has on the DV.  b. The sign of the coefficient gives you the direction of the effect.  c. With a single IV, the coefficient tells you how much the DV is expected to increase or decrease when the IV increased by one unit.  d. All of the above.

The idea of a large, stable middle class (defined as those with annual household incomes in 2010 between $42,000 and $126,000 for a family of three), is central to America's sense of itself. But the U.S. middle class shrank steadily from 61% of all adults in 1971  (t = 0)  to 51% in 2011  (t = 4),  where t is measured in decades. Research has shown that this decline was approximately linear.† (a) Find a linear function f(t) giving the percentage of middle-income adults in decade t, where t = 0 corresponds to 1971. (b) If this trend continues, what will the percentage of middle-income adults be in 2041?

The table below show data that has been collected from different fields from various farms in a certain valley. The table contains the grams of Raspberries tested and the amount of their Vitamin C content in mg. Find a linear model that express Vitamin C content as a function of the weight of the Raspberries. Round your answers to 3 decimal places y= Raspberry Type Farm A - North Field Farm B - North Field Farm A - South Field Farm B - South Field Farm C -Small Field Farm D Farm E x+ grams 60 65 70 75 80 85 90 Vitamin C content in mg 14.3 16.1 18.9 20.3 22.8 25.5 27.5 According to this model, how many mg of Vitamin C can be expected in a raspberry that weighs 82 grams Round to 3 decimal places.