Case Scenario: A mother drops off her 15-year-old son at soccer practice. He plays for a traveling team, and she is headed to the grocery store to do some shopping while he is occupied. While at the store, she receives a telephone call from the coach, telling her that her son was kicked just below the knee, causing him to fall to the ground. He was wearing his shin guards but complains that it hurts too much to walk. The mother turns around and heads back to the soccer field. When she arrives, her son is sitting on the bench with ice on his leg. The coach and a teammate help her get him into the car, and she drives him to the emergency department. An x-ray image shows a fracture near the knee with subluxation.

1. Question: The doctor tells the mother that her son has suffered a complete separation of a ligament from its bony attachment, and they will attempt a closed reduction. Describe this procedure to the mother. You will need to defend your answer using specific facts, data, and other information.

Get a sheet of paper and draw a horizontal optical axis. Next, draw a vertical line near the center of the optical axis to represent your lens, then measure out and draw the focal points. Assume the focal length to be 2cm. Pick an object point 6cm away from the lens on the top left-hand side of the paper. Draw the three simple case rays – parallel, through the center of the lens, and through the focal point – and locate the image formed on the other side of the lens.

Question 1: Get another sheet of paper and repeat step 1, however instead draw the object point inside the focal length, 1cm away from the lens. Again draw the three simple case rays

What do you observe? Do the lines converge at a given point???

Question 2: Get a third sheet of paper and repeat the ray tracing procedure for a concave lens with focal length -2cm. Place the object outside of the focal length, 4cm to the left of the lens

Do the rays converge at a given point?

Hart Company sells and delivers office furniture across Western Canada.

The costs associated with the acquisition and annual operation of a delivery truck are given below:

  Insurance$3,593   Licences$205   Taxes (vehicle)$122   Garage rent for parking (per truck)$1,220   Depreciation ($25,500 ÷ 5 years)$5,100   Gasoline, oil, tires, and repairs$0.20/km

3. Assume that the company decides to use the truck during the second year. Near year-end, an order is received from a customer over 1,000 kilometres away. What costs from the previous list are relevant in a decision between using the truck to make the delivery and having the delivery done commercially? (Round your answer to 2 decimal places.)

4. Occasionally, the company could use two trucks at the same time. For this reason, some thought is being given to purchasing a second truck. The total kilometres driven would be the same as if only one truck were owned. What costs from the previous list are relevant to a decision about whether to purchase the second truck?

Weatherwise is a magazine published by the American Meteorological Society. One issue gives a rating system used to classify Nor'easter storms that frequently hit New England and can cause much damage near the ocean. A severe storm has an average peak wave height of μ = 16.4 feet for waves hitting the shore. Suppose that a Nor'easter is in progress at the severe storm class rating. Peak wave heights are usually measured from land (using binoculars) off fixed cement piers. Suppose that a reading of 39 waves showed an average wave height of x = 17.3 feet. Previous studies of severe storms indicate that σ = 3.5 feet. Does this information suggest that the storm is (perhaps temporarily) increasing above the severe rating? Use α = 0.01.

a.) What are the null and alternate hypotheses?

b.) What is the value of the sample test statistic? (Round your answer to two decimal places.)

c.) Estimate the P-value.

d.) Will you reject or fail to reject the null hypothesis? Are the data statistically significant at level α?

When do we use I=P/a or I=P/4pi(r)^2?

for example question 1:

30 seconds of exposure to 115 dB sound can damage your hearing, but a much quieter 94 dB may begin to cause damage after 1 hour of continuous exposure.You are going to an outdoor concert, and you'll be standing near a speaker that emits 50W of acoustic power as a spherical wave. What minimum distance should you be from the speaker to keep the sound intensity level below 94 dB?

- we used I=P/4pir^2

Question 2:

A woman wearing an in-ear hearing aid listens to a television set at a normal volume of approximately 60 dB. To hear it, she requires an amplification of 30 dB, so the hearing aid supplies sound at 90 dB to the ear canal, which we assume to be circular with a diameter of 7 mm. What is the output power of the hearing aid?

why did we use I=P/a not I=P/4pir^2?

1. Heights of all tall buildings in San Francisco 500 feet or higher.

a) Is this a sample or population? _____ 500 525 529 529 538 541 550 564 565 569 570 573 600 600 641 645 695 779 853

b) Mean __________

c) Standard Deviation ___________

d) Variance ____________

e) 5# Summary ______________________________________

f) IQR _____________

g) Upper fence ____________

h) Lower fence ___________

i) Are there any outliers? _________

If so, identify them: ______________________

j) Make a stemplot k) Draw a boxplot showing any outliers

i) Shape? ______________________ (Leaf unit 10)

2. State the Empirical Rule for symmetric and near normal distributions.

Approximately _____% of the data lie within ___ standard deviation of the mean.

Approximately _____% of the data lie within ___ standard deviations of the mean.

Approximately _____% of the data lie within ___ standard deviations of the mean.

3. Class test scores are normally distributed with mean 64 and standard deviation 10.

Find the proportion of scores using the Empirical Rule.

Make a sketch for each problem.

a) X > 74 a) 44 < X < 74

b) X < 44

Please match term with description. Answers may be used more than once or not at all.

a. High-threshold neurons

b. low-threshold neurons

c. frequency specificity

d. poststimulus time histograms

e. characteristic frequency

f. tuning curve

g. tonotopic array

h. crossed and uncrossed olivocochlear bundles

i. Interspike interval histogram

1. _____ This is the frequency to which a neuron is most responsive.

2. _____ This provides a means of determining the frequency response of a specific VIII nerve fiber.

3. _____ These respond at low signal levels and display random firing even when no stimulus is present.

4. _____ When stimulated this/these cause reduction in firing rate of VIII nerve fibers.

5. _____ These are plots of neural response relative to the onset of the stimulus.

6. _____ This is a composite of the responses of a single fiber at each frequency of stimulation.

7. _____ These require higher intensity before being stimulated to fire.

8. _____ This/These may process near-threshold sounds.

9. _____ This refers to the systematic low-to-high frequency relationship displayed throughout the auditory nervous system.

Over the past two years, Kermit Stone, the controller of Hilton Company, has been concerned that the company has been paying a large amount of money for state unemployment taxes. On reviewing the “unemployment file” with the head accountant, Deborah Murtha, he learns that the company's tax rate is near the top of the range of the state's experience-rating system.

After calling the local unemployment office, Stone realizes that the turnover of employees at Hilton Company has had an adverse effect on the company's tax rates. In addition, after consulting with Murtha, he discovers that the eligibility reports that come from the state unemployment office are just signed and sent back to the state without any review.

The eligibility reports are notices that an ex-employee has filed a claim for unemployment benefits. By signing these reports “blindly,” the company, in effect, tells the state that the employee is eligible for the benefits. Any benefits paid are charged by the state against Hilton Company's account.

Submit recommendations that might help Stone reduce the burden that the unemployment compensation taxes are leveling on Hilton Company.

You have been hired to investigate possible fraud losses in Greenwor Manufacturing Company. Greenwor’s attorney contacted you in confidence and told you that she has had many tips indicating that Chad Wits, the CFO, is somehow stealing large sums of money from the company. Wits earns a good salary of $300,000 per year, but company employees report that he has recently purchased a $4 million house, a sail yacht worth at least $2 million, and one employee said that he spends his weekends in Las Vegas, where he loses very large sums of money on a regular basis. Some employees have seen him driving a new Maserati sports car near a local shopping mall, but he always arrives at work with a plain, aged family car.

Required a) What steps would you take to conduct your investigation? b) What information would you need to develop a fraud theory? c) Does the information you currently have provide sufficient predication for an investigation?

1. A car washing and lubricating company has been operating for more than 10 years in a terrain with the following characteristics: porous, filterable with a freatic level near to the surface (5 m depth). This area is close to the estuary which is very useful to them since all the disposals and waste generated by this activity are directly released into the estuary. These disposals contain a high level of oils and greases. All the dumping from the car maintenance goes directly into the soil since there are no palettes or gutters. The operation hours are 20 hours for seven days a week. On the complaint of the locals, the Municipal Council has arranged the execution of an Environmental Impact Assessment (EIA) and you are part of it. What type of environmental evaluation must be performed by the Municipality according to this case?

a) What type of environmental evaluation must be performed by the Municipality according to this case?

b) What type of proposed professionals that will be part of the consultancy group performing the EIA?

c) List three environmental effects of this activity.

d) Mention three mitigation measures you will propose as part of your Environmental Management Plan (EMP) to mitigate the impacts identified.