Read the question below, then fill in the correct answer.

Ten-packs of gum are on sale for $4, but there is a store limit of five packs per customer. The function$C(x)$gives the cost$C$for$x 10$-packs. Which of the following best represents the range of this function?

A.$\{4\}$B.$\{5\}$C.$\{0,1,2,3,4,5\}$D.$\{0,4,8,12,16,20\}$

What is the primary reason for using blocking when designing an experiment?

Assume that 50% of full-time college students have jobs (based on data from the Department of Education and USA Today). Also, assume that a simple random sample of 50 full-time college students is brought.

c. Find the probability that among 50 randomly selected full-time college students, at least 20 have jobs.

A scale is designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean of 0 g and a standard deviation of 1 g. (If the scale reading is too low, the error is negative. If the scale reading is too high, the error is positive.) If 16 items are randomly selected and weighed, what is the probability that the mean of the errors is between -0.5 g and 0.5 g?

Assume that the test scores from a college admissions test are normally distributed, with a mean of 450 and a standard deviation of 100.

What percentage of the people taking the test score between 400 and 500?

A study described in the British Medical Journal (January 2004) sought to determine whether exercise would help extend the lives of patients with heart failure. A sample of 801 patients with heart failure was recruited; 395 received exercise training and 406 did not. There were 88 deaths among the exercise group and 105 among those who did not exercise. Can researchers infer that exercise training reduces mortality?

A scale is designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean of 0 g and a standard deviation of 1 g. (If the scale reading is too low, the error is negative. If the scale reading is too high, the error is positive.) If an item is randomly selected and weighed, what is the probability that it has an error between -0.5 g and 0.5 g?

I do not like $\underline{\text{Shelly playing of the radio so loudly in the car.

A. NO CHANGE

B. Shelly, to play

C. Shelly; playing

D. Shelly's playing

Many students say they would like to be a manager someday. Here are some questions to get you started thinking like a manager:

$$\newline$$

Do you see any problems with a participative (democratic) leadership style? Can you see a manager getting frustrated when he or she can’t control others?

Use the information given in the exercise to find the necessary confidence interval for the population means $\mu$. Interpret the interval that you have constructed. A $95 \%$ confidence interval, $n=36, \bar{x}=13.1$, $s^2=3.42$

The name of the injury involving the semilunar cartilages in the knee is

A. rotator cuff tear.

B. torn meniscus.

C. sciatic injury.

D. compression injury.

A scale is designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean of 0 g and a standard deviation of 1 g. (If the scale reading is too low, the error is negative. If the scale reading is too high, the error is positive.) What is the 90th percentile for the errors?

Your parents are considering a $75,000, 30-year mortgage to purchase a new home. The bank at which they have done business for many years offers a rate of 7.54 % compounded monthly. A competitor is offering 6.87% compounded monthly. Would it be worthwhile for your parents to switch banks? Explain.

Find the inverse of the following relation.

$$\{(4,-15),(-8,-18),(-2,-16.5),(3,-15.25)\}$$