100 patients with infectious hepatitis and 100 neighbourhood healthy control were questioned regarding a history of eating raw clams or oysters within the preceding 3 months.
-What is the study type/design?
-what were the key features in this text that assist you in deciding that this is the design?
-What are the advantage /disadvantage of using this design?
-What could be the research question or hypothesis of this study?
In: Statistics and Probability
Two payment plans are considered. Plan A pays $100 immediately, $200 in 2 years and $100 in 3 years. Plan B simply pays $350 immediately.
(a) Compare the present values of Plan A and Plan B at 7.8% and 8.5% effective interest rate per year.
(b) Assume Plan A is purchased for $350 at the time of the first payment.
Prove the existence of a unique yield rate which lies between 7.8% and 8.5%.
(c) Using a single iteration of linear interpolation between 7.8% and 8.5%, find an approximate yield rate.
In: Finance
Independent Samples T-test
1. If n1 = 100 and n2 = 100, determine the critical value of t for an independent samples t test, two-tailed alpha = .05.
2. Calculate pooled variance: n1 = 12, s21 = 7.4 and n2 = 13, s22 = 8.2
3. A physician compared the cholesterol levels of a representative sample of Americans who are an American diet vs a representative sample who followed a Mediterranean diet. American diet (control): M = 230, s2 = 24, n = 36; Mediterranean diet (experimental): M = 190, s2 = 26, n = 36. Go through the hypothesis testing steps to write your hypotheses, identify the critical t value, and t value.
4. A nutritionist compared the effectiveness of an online diet program to that of an in-person diet program. After three months, she compared the number of pounds of weight lost. The control (in-person) group lost a mean of 18 pounds (n = 16, s2 = 14.50) and the experimental group (online) lost 16 pounds ( n = 21, s2 = 13.30). Go through the hypothesis testing steps to write your hypotheses, identify the critical t value, and t value.
In: Statistics and Probability
A multiple regression equation of quality of life scale (0-100,
100 is best) associated with Age (year), Income (unit US $), CD4
count from 695 Africa HIV infected women is
The quality of life scale = 32.121 + 0.060 * Income + 0.017 * CD4
count - 0.045 * Age.
Based on this regression equation, please answer following
questions 15 to 29.
____________________________________________________________________
Given an Africa HIV infected woman with an income $200, CD4 250 and
age 40, the predicted quality of life scale is
Group of answer choices
32.121
46.571
34.571
Can not be determined
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Question 163.44 pts
Given an Africa HIV infected woman with an income $100 and CD4 200, the predicted quality of life scale is
Group of answer choices
32.121
46.571
34.571
Can not be determined
Flag this Question
Question 173.44 pts
In this multiple regression equation, the intercept is
Group of answer choices
32.121
46.571
34.571
Can not be determined
Flag this Question
Question 183.44 pts
Given an Africa HIV infected woman with no income, CD4 250 and age 40, the predicted quality of life scale is
Group of answer choices
32.121
46.571
34.571
Can not be determined
Flag this Question
Question 193.44 pts
In this multiple regression equation, the quality of life scale is
Group of answer choices
Independent variable
Dependent variable
Neither independent variable, nor dependent variable
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Question 203.44 pts
In this multiple regression equation, the income is
Group of answer choices
Independent variable
Dependent variable
Neither independent variable, nor dependent variable
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Question 213.44 pts
In this multiple regression equation, the CD4 count is
Group of answer choices
Independent variable
Dependent variable
Neither independent variable, nor dependent variable
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Question 223.44 pts
In this multiple regression equation, the age is
Group of answer choices
Independent variable
Dependent variable
Neither independent variable, nor dependent variable
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Question 233.44 pts
The difference of predicted quality of life scale between the woman with an income $200, CD4 250 and age 40 and the woman with no income, CD4 250 and age 40 is
Group of answer choices
0.450
12.000
1.7
6.000
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Question 243.44 pts
The difference of predicted quality of life scale between the woman with an income $200, CD4 250 and age 40 and the woman with an income $100, CD4 250 and age 40 is
Group of answer choices
0.450
12.000
1.7
6.000
Flag this Question
Question 253.44 pts
The difference of predicted quality of life scale between two women with same income and same CD4 count, but one age 30 and the other 40, is
Group of answer choices
0.450
12.000
1.7
6.000
Flag this Question
Question 263.44 pts
The difference of predicted quality of life scale between two women with same income and same age, but one CD4 count 200 and the other 100, is
Group of answer choices
0.450
12.000
1.7
6.000
Flag this Question
Question 273.44 pts
As income increases one dollar, the predicted quality of life scale increases
Group of answer choices
32.121
0.060
0.017
-0.045
Flag this Question
Question 283.44 pts
As CD4 count increases one count, the predicted quality of life scale increases
Group of answer choices
32.121
0.060
0.017
-0.045
Flag this Question
Question 293.44 pts
As age increases one year, the predicted quality of life scale increases
Group of answer choices
32.121
0.060
0.017
-0.045
In: Statistics and Probability
A 12-inch well penetrating a 100-ft thick eenfinedr aquifer is pumped at a rate of 100 gpm for 10 years. Determine the drawdown of 100-ft from the well. The storage coefficient of the aquifer is 0.001, permeability 500 gpd/ft, r/B = 0.2, and porosity= 0.3?
In: Civil Engineering
Assume a normal distribution of the form N(100, 100), answer the following questions:
What proportion of the distribution falls within 1 standard deviation of the mean (e.g., within -1 and 1 standard deviation)?
What is the probability of a single draw from that distribution has a value greater than 115?
What is the range that captures the middle 95% of the population distribution?
If I randomly sample 10 observations from this distribution and calculate a mean, what is the probability that this mean is greater than 106?
If we center the sampling distribution on 100, then what is the range that will capture 95% of the means calculated from a sample of 20 observations?
In: Math
Exercise 1: An Engineering company has a total of 100 employees. Out of 100; 4 employees have been in the company for 1 year 11 employees have been in the company for 2 years 19 employees have been in the company for 3 years 40 employees have been in the company for 4 years 20 employees have been in the company for 5 years 4 employees have been in the company for 6 years 1 employee has been in the company for 8 years 1 employee has been in the company for 10 years Find out the average employee tenure. In your opinion, is it a good average employee tenure?
In: Operations Management
You titrate 100 mL of a .0250 M solution of benzoic acid (HBz) with .100 M NaOH to the equivalence point. Devolop a titration curve for this reaction when 0.00, 6.25, 12.5, 24.5, 25.0, 25.5, and 26 mL of titrant is added
In: Chemistry
Calculate the diffusion coefficient of N2 at 100 Pa, 100 kPa an 20 MPa (temperature T = 20 degrees celsius).
In: Chemistry
Case Study: Assume that the company, where you are working as a team in Financial Department, is considering a potential project with a new product that is expected to sell for an average price of $22 per unit and the company expects it can sell 650 000 unit per year at this price for a period of 4 years. Launching this project will require purchase of a $3 500 000 equipment that has residual value in four years of $500 000 and adding $ 850 000 in working capital which is expected to be fully retrieved at the end of the project. Other information is available below: Depreciation method: straight line Variable cost per unit: $17 Cash fixed costs per year: $450 000 Discount rate: 10% Tax Rate: 30% Do a scenario analysis with cash flows of the assumed project to determine the sensitivity of the project’s NPV to different scenarios that are defined in terms of the estimated values for each of the project’s value drivers. Please work on two scenarios corresponding to the worst- and best-case outcomes for the project. You need to provide your results in (a) relevant tables: Worst case: Unit sales decrease by 20%; price per unit decreases by 20%; variable cost per unit increases by 20 %; cash fixed cost per year increases by $100 000 Best case: Unit sales increase by 20%; price per unit increases by 20%; variable cost per unit decreases by 20%; cash fixed cost per year decreases by $100 000 Based on the scenario analysis outcome, draw relevant conclusion about project NPV’s sensitivity.
In: Finance