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Question: Suppose that you are following a group of children for the development of asthma over a one- year period. You identify 100 children on January 1st, screen them for asthma, and set up a monitoring program to check on their status on a monthly basis. Five children are considered prevalent cases because they were diagnosed with asthma before January 1st. Ten children develop asthma on March 1st and another ten children develop asthma on July 1st. Another 10 children who remain healthy were followed for six months and then were lost to follow-up. All of the remaining children did not develop asthma and were not lost to follow-up. Follow-up ended on December 31st.
1. What was the prevalence of asthma on June 1st?
2. What was the prevalence of asthma on September 1st?
3. How many person-months of observation were accrued by this population?
4. What was the incidence rate of asthma in this population for the one-year period?
An office supply company sells x mechanical pencils per year at $p per pencil. The demand equation for these pencils is p=10-0.001x. The total annual cost of manufacturing x mechanical pencils is C(x)=5000+2x.
assume that the weight loss for the first month varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution. find the probability of the given range of pounds lost.
For solving a system of equations, is there a difference between using an algebraic method and using the graphical method? Explain why or why not
"The company must consider man factors in setting its pricing policy."(Kotler et al ed 15e p489) Discuss in detail using practical examples, the six steps procedure organizations can use when setting price and what factors may influence each step.
Michael wins $600,000 (after taxes) in the lottery and decides to invest half of it in a 5-year CD that pays 4.95% interest compounded monthly. He invests the other half in a money market fund that retirement account that averages 7.3% interest c..
What is the probability of three successes and three failures?
In 10 tosses of a fair coin, would you be surprised to see exactly 6 heads? In 1000 tosses of a fair coin, would you be surprised to see exactly 600 heads? Of the two scenarios, which is the more surprising and why?
A labeled tree is a tree where each vertex is assigned a label. Two labeled trees are considered isomorphic when there is an isomorphism between them that preserves the labels of vertices. How many nonisomorphic trees are there with three vertices..
a pipe 4 inches in diameter and 6 feet 10 inches long is 3 quarters full of water. if 1 cubic foot of water equals
What should the dimentions be for maximum area.
Consider a rectangular box of volume 100 cubic centimters. Suppose that the base is a rectangle with sides x centimeters and 2x centimeters. Let hx give the height of the box in centimeters and let Ax be the total area of the six sides of the box.
An astronaut jumps into the air with an initial upward velocity of 50 ft/sec. (A). How high does he go? (in feet) (B). How long is the astronaut off the ground?
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