Consider each of these situations. Do you think the proposed sampling method is appropriate? Explain. a) We want to know if there is neighborhood support to turn a vacant lot into a playground. We spend a Saturday afternoon going door to door in the neighborhood, asking people to sign a petition. b) We want to know if students at our college are satisfied with the selection of food available on campus. We go to the largest cafeteria and interview every 10th person in line.

A check of residence hall rooms on a large college campus revealed that 38% had refrigerators, 52% had TVs, and 21% had both a TV and a refrigerator. What's the probability that a randomly selected residence hall room has a) a TV but no refrigerator? b) a TV or a refrigerator, but not both? c) neither a TV nor a refrigerator?

Find the gradient of the tangent to the graph of $y=x^{2}-2$, at each of the points with the given x-coordinate. (a) 1 (b) 4 (c) 0 (d) -2 (e) -0.2 (f) -3.5 (g) p (h) 2p

Find the percent of discount or markup.

$\$52$ sweater on sale for $\$31.20$

Researchers conducted a study to determine whether magnets are effective in treating back pain, with results given below (based on data from "Bipolar Permanent Magnets for the Treatment of Chronic Lower Back Pain: A Pilot Study," by ColJacott, Zimmerman, White, and Rindone, Journal of the American Medical Association, Vol. 283, No. IO). The values represent measurements of pain using the visual analog scale. Use a 0.05 significance level to test the claim that those given a sham treatment (similar to a placebo) have pain reductions that vary more than the pain reductions for those treated with magnets.

$$\begin{aligned} \text { Reduction in Pain Level After Sham Treatment: } & n = 20 , \overline { x } = 0.44 , s = 1.4 \\ \text { Reduction in Pain Level After Magnet Treatment: } & n = 20 , \overline { x } = 0.49 , s = 0.96 \end{aligned}$$

Most people think that the "normal" adult body temperature is $98.6^{\circ} \mathrm{F}$. That figure, based on a 19th-century study, has recently been challenged. In an article in the Journal of the American Medical Association, researchers reported that a more accurate figure may be $98.2^{\circ} \mathrm{F}$. Furthermore, the standard deviation appeared to be around $0.7^{\circ} \mathrm{F}$. Assume that a Normal model is appropriate. a) In what interval would you expect most people's body temperatures to be? Explain. b) What fraction of people would be expected to have body temperatures above $98.6^{\circ} \mathrm{F}$? c) Below what body temperature are the coolest 20% of all people?

Write a program that prompts the user to enter a decimal integer and displays its corresponding octal value. Don’t use Java’s Integer .toOctalString(int) in this program.

In each of the following situations, is the alternative hypothesis one-tailed or two-tailed? What are the hypotheses? a) In recent years, 10% of college juniors have applied for study abroad. The dean's office conducts a survey to see if that's changed this year. b) A pharmaceutical company conducts a clinical trial to see if more patients who take a new drug experience headache relief than the 22% who claimed relief after taking the placebo. c) At a small computer peripherals company, only 60% of the hard drives produced passed all their performance tests the first time. Management recently invested a lot of resources into the production system and now conducts a test to see if it helped.

Implement the preorder method in BST using a stack instead of recursion. Write a test program that prompts the user to enter 10 integers, stores them in a BST, and invokes the preorder method to display the elements.

If a method in a subclass has the same name as a method in its superclass with different parameter types, is the method overridden or overloaded?

Find the equation of the normal to the curve $y=\sqrt{6 x+3}$ at the point for which x = 13.

A garden in the shape of regular hexagon has sides that are each 5 meters long. If the height of each of the congruent triangles within the hexagon is about 4.33 meters, what is the area of the garden?

Find the cost function for the given marginal cost and fixed cost.

$$\begin{matrix} \text{Marginal Cost} & \text{Fixed Cost (x=0)}\\ \text{}{\frac{d C}{d x}=\frac{1}{50} x+10} & \text{\$1000}\\ \end{matrix}$$

Consider the following statement and circle the correct word in each of the shaded segments of the statement.

The recursive process uses the first | previous term, whereas the explicit process uses the first | previous term.