A professor teaching a large lecture class of 350 students samples her class by rolling a die. Then, starting with the row number on the die (1 to 6), she passes out a survey to every fourth row of the large lecture hall. She says that this is a Simple Random Sample because everyone had an equal opportunity to sit in any seat and because she randomized the choice of rows. What do you think? Be specific.

Administrators at Texas A&M University were interested in estimating the percentage of students who are the first in their family to go to college. The A&M student body has about 46,000 members. What problems do you see with asking the following question of students? "Are you the first member of your family to seek higher education?"

The company 's annual report states, "Our survey shows that 87.34% of our employees are 'very happy 'working here." Comment on that claim. Use appropriate statistics terminology.

What problems do you see with asking the following question of students? "Are you the first member of your family to seek higher education?"

Consider each of these situations. Do you think the proposed sampling method is appropriate? Explain. We want to know if there is neighborhood support to turn a vacant Jot into a playground. We spend a Saturday afternoon going door-to-door in the neighborhood, asking people to sign a petition.

Administrators at Texas A&M University were interested in estimating the percentage of students who are the first in their family to go to college. The A&M student body has about 46,000 members. A professor teaching a large lecture class of 350 students samples her class by rolling a die. Then, starting with the row number on the die (1 to 6), she passes out a survey to every fourth row of the large lecture hall. She says that this is a Simple Random Sample because everyone had an equal opportunity to sit in any seat and because she randomized the choice of rows. What do you think? Be specific.

Solve the percent problem. 1.8 is 72% of what number?

At $2000^{\circ} \mathrm{C}$ the equilibrium constant for the reaction

$$2 \mathrm{NO}(g) \rightleftharpoons \mathrm{N}_2(g)+\mathrm{O}_2(g)$$

is $K_c=2.4 \times 10^3$. If the initial concentration of $\mathrm{NO}$ is $0.200 \mathrm{M}$, what are the equilibrium concentrations of NO, $\mathrm{N}_2$, and $\mathrm{O}_2$ ?

An ideal transformer has a turns ratio of n=10. The secondary winding is connected to a load $Z_{\mathrm{L}}=600+j 100 \Omega$. The primary is connected to a voltage source with a peak amplitude of $400 \mathrm{~V}$ and an internal impedance of $Z_{\mathrm{s}}=j 7 \Omega$. Find the average power delivered to the load.

Write equilibrium constant expression for the following reaction N$_2$(g) + 3H$_2$ $\rightleftharpoons$ 2NH$_3$(g)

The Original Medicare Plan consists of Hospital Insurance (Medicare Part A) and Medical Insurance (Medicare Part B). For each of the following losses, indicate whether the loss is covered under Medicare Part A or Medicare Part B. (Ignore any deductible or coinsurance requirements. Treat each situation separately.)

• a. Mary, age 66, is hospitalized for five days because of a heart attack.
• b. John, age 62, has prostate cancer and visits his family doctor for treatment.
• c. Marion, age 80, is a patient in a skilled nursing facility. She has been confined to the nursing home for more than two years.
• d. Don, age 72, has a hearing impairment and obtains a hearing aid from a local firm.
• e. Sarah, age 68, has a speech impairment and is confined to her home because of a stroke. A licensed speech therapist visits her in the home and provides services to restore her speech.
• f. Fred, age 78, has an arthritic hip that makes it painful to walk and needs surgery to have the hip replaced.
• g. Michael, age 65, is covered under the Original Medicare Plan. His spouse, age 62, has cancer and requires chemotherapy.

The element molybdenum (Mo) is another micronutrient that can limit primary production in the oceans. If the researchers found the following results for additions of Mo, what would you conclude about its relative importance for growth?

$$\begin{array}{lr} N+P+M o & 6.0 \\ N+P+F e+M o & 72.0 \end{array}$$

True or false: Drug or toxin exposure can be established only if exposure occurred within the past six months.

To __________ a value means to increase it by one.