4 of these questions are wrong. I need to know which question I got wrong because I am not sure.

• During the early and middle twentieth century, there was

1. a sharp increase in human birth rate.
2. a sharp decrease in human death rate.
3. (both)
4. (neither)

True/False:

• If you ask a population ecologist, all the individuals in a population belong to the same species. : True
• A single population might exist in multiple territories that do not overlap, with no migration of individuals between territories.,true
• A population's carrying capacity depends on the action of parasites. fasle
• Most populations have a random dispersion pattern. False
• In general, animals are most likely to die at an age near their maximum possible lifespan. fasle

The electrons in the beam of a television tube have an energy of 13 keV. The tube is oriented so that the electrons move horizontally from north to south. The vertical component of the Earth's magnetic field at the location of the television has a magnitude of 42.0 ?T and is pointing down.

a) In which direction does the force on the electrons act (enter N for north, S for South, E for East, or W for West)?  
Neglect a possible horizontal component of the magnetic field.

b) What is the magnitude of the acceleration due to the vertical component of the Earth's magnetic field of an electron in the beam?

c) If the inclination of the earth's magnetic field near the TV is 51deg, calculate the magnitude of the force on the electrons due to the horizontal component of the Earth's magnetic field.

1. Suppose the equilibrium price for an average hospital stay in the absence of insurance is $10,000. At that price, 1000 people are hospitalized each year. Now suppose an insurer offers a policy to lower the out of pocket price of a stay to $100, and at that price, 1200 people are hospitalized.

a) How much TOTAL premium revenue must be collected to finance this arrangement?

b) How much premium revenue per hospitalized person must be collected? Would the average person be willing to pay this premium if they were risk averse?

c) Now suppose there are 120,000 people near this hospital, all of whom think they have an equal chance (1%) of being hospitalized. What must the per person premium be now?

You have purchased a long-term coupon bond maturing in n periods selling for the price pn,t in the secondary market. You expect the Federal Reserve to raise the Federal Funds rate (interest rates) in the very near future. Should you sell your bond today or continue to hold on to it? What do you expect the price of the bond to be in one period? What do you expect to happen to the yield to maturity? What is your expected capital gain or loss if you hold onto the bond? What is the rate of return? Do you expect the rate of return to be positive or negative? Use the pricing equation in your answer to receive full credit.

Assume now that XYZ is hit by extremely bad news. In the current situation, XYZ’s assets therefore have a value of $550,000, which is problematic because XYZ owes $600,000 to the debt holders, who must be repaid in the near future. The management of XYZ is considering a new risky strategy that can either increase the value of XYZ’s assets to $700,000 or reduce its value to $200,000. Both outcomes are equally likely. XYZ can switch to the new strategy without having to make an upfront investment.

Question: What is the expected payoff to the equity holders and debt holders under the current and new strategy? Explain whether it is in the interests of the equity holders and debt holders to switch to the new strategy.

"Humans acquire Staphylococcus saprophyticus from direct exposure to animals or inadequately cooked animal food products. Young women are more susceptible to genitourinary colonization than are others, and some people develop infection in association with hormonal influences that occur near or during menstruation. Sexual intercourse promotes colonization and infection. Alterations in the genital flora effected by spermicides or candidal infection favor colonization by S. saprophyticus. Anal intercourse may play a role in infection in homosexual men."

I am having trouble trying to figure out the relation between acquiring Staphylococcus saprophyticus from animals versus sexual intercourse. How are humans infected by Staphylococcus saprophyticus, and what would the symptoms of that be?

The Tasty Sub Shop Case:

A business entrepreneur uses simple linear regression analysis to predict the yearly revenue for a potential restaurant site on the basis of the number of residents living near the site. The entrepreneur then uses the prediction to assess the profitability of the potential restaurant site.

And

The QHIC Case:

The marketing department at Quality Home Improvement Center (QHIC) uses simple linear regression analysis to predict home upkeep expenditure on the basis of home value. Predictions of home upkeep expenditures are used to help determine which homes should be sent advertising brochures promoting QHIC’s products and services.

Discuss the difference in the type of prediction in both cases and provide rational of the reasons that these predictions were used.

In a scientific study that tries to relate the biodiversity of macro invertebrates to the acidity of the water near mines, samples of macro invertebrates were taken at the rate of a monthly sample for 12 months in two different locations. For the first locality, an average biodiversity index of 3.11 and a sample standard deviation of 0.771 were obtained. For the second locality the average biodiversity index was 2.04 with a standard deviation of 0.448.

a. Build and interpret a 90% confidence interval for the difference in the means of the two localities assuming that the populations conform approximately to a normal population and that the variances can be considered equal.

b. Assess whether the evidence supports the presumption of equal variances

c. Would it have been better to use a 95% range? Explain in detail

In a scientific study that tries to relate the biodiversity of macro invertebrates to the acidity of the water near mines, samples of macro invertebrates were taken at the rate of a monthly sample for 12 months in two different locations. For the first locality, an average biodiversity index of 3.11 and a sample standard deviation of 0.771 were obtained. For the second locality the average biodiversity index was 2.04 with a standard deviation of 0.448.

a). BUILD and INTERPRET a 90% confidence interval for the difference in the means of the two localities assuming that the populations conform approximately to a normal population and that the variances can be considered equal.

b). Assess whether the evidence supports the presumption of equal variances

c). Would it have been better to use a 95% range? Explain in detail

In a scientific study that attempts to relate the biodiversity of macro invertebrates to the acidity of the water near mines, samples of macro invertebrates were taken at the rate of a monthly sample for 12 months in two different locations. For the first locality, an average biodiversity index of 3.11 and a sample standard deviation of 0.771 were obtained. For the second locality the average biodiversity index was 2.04 with a standard deviation of 0.448.

a) BUILD and INTERPRET a 90% confidence interval for the difference in the means of the two localities assuming that the populations fit approximately a normal population and that the variances can be considered equal.

b) Evaluate whether the evidence supports the presumption of equal variances.

c) Would it have been better to use a 95% interval? Explain in detail.