X3 = -18.8 + 4.0x, + 9.3x4 - 1.3x, (a) Which variable is the response variable? Which variables are the explanatory variables? (b) Which number is the constant term? List the coefficients with their corresponding explanatory variables. (c) If x1 X3? = 10, X4 = -4, and x- = 4, what is the predicted value for (d) Explain how each coefficient can be thought of as a "slope" under certain conditions. Suppose x, and x7 were held at fixed but arbitrary values. If x4 increased by 1 unit, what would we expect the corresponding change in x3 to be? If x4 increased by 3 units, what would be the corresponding expected change in x3? If X4 decreased by 2 units, what would we expect for the corresponding change in x3? (e) Suppose that n = 11 data points were used to construct the given regression equation and that the standard error for the coefficient of x¼ is 0.857. Construct a 90% confidence interval for the coefficient of x4. (f) Using the information of part (e) and level of significance 1%, test the claim that the coefficient of xĄ is different from zero. Explain how the conclusion has a bearing on the regression equation.

Sketch a graph of f(x) = 2x + 5x2/5. Which of the following figures represents the curve of this function? Select the correct answer below: -4 -4 -3 -3 -2 -2 -1 -1 0 -3 1 0 -1 0 1 2 3

Suppose B = (8, -7) and AB = (1, -13). Then 0 A=

The Plush Zo store sells stuffed animals. The store is running a special on teddy bears this month. One day, the shopkeeper took a sample of stuffed animals at the store. She found that 4 of the 15 stuffed animals that she sampled were teddy bears. The store had 590 stuffed animals on that day, and 110 of those stuffed animals were teddy bears. For the shopkeeper's sample, find and write with proper notation the population proportion and sample proportion of stuffed animals that were teddy bears. Write the proportions as decimals (not percentages) rounded to two decimal places. (a) Population proportion: (Choose one) V ? (b) Sample proportion: (Choose one) ▼