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horsena [70]
3 years ago
15

Left ventricular mass (LVM), determined from echocardiograms, is an important risk factor for subsequent cardiovascular disease.

The researchers are interested in assessing whether LVM changes in children over a 4-year period. To help plan the main study, a pilot study is conducted where echocardiograms are obtained from 10 random children from the Bogalusa Heart Study at baseline and after 4 years of follow-up. The sample mean of LVM change over the 4-year study period is 18.9 g and the sample standard deviation is 26.4 g. For answering the questions (a) and (b) below, assume that the sample variance of LVM change in this pilot study is the true variance of LVM change in the population.(a). If the expected increase in LVM is 10 g, what is the power of such a study if a two-sided test is to be used with α = 0.05? (b). Since this is a pilot study, the main question of interest is how many subjects would be needed to detect an increase of 10 g in mean LVM over 4 years using a two-sided test with α = 0.05 and power = 80%? Suppose the researchers also want to get an idea of the true population variance σ 2 of LVM change in children over a 4-year period based on the pilot data. (c). Perform a hypothesis test to assess whether σ 2 is significantly different from 300. Use both critical-value and p-value methods. (d). Find a 95% confidence interval (CI) of σ 2 . Is the result consistent with that of (c)? Justify your answer.
Business
1 answer:
polet [3.4K]3 years ago
7 0

Answer:

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Sigma Corporation owns 80% of the stock of Epsilon Corporation, which pays it a dividend of $100,000. Sigma Corporation also own
kvv77 [185]

Answer:

d. $132,000

Explanation:

Sigma Corporation holds the stock of Epsilon Corporation and is subsidiary for the Sigma. The dividend declared by of $100,000 is entirely for the sigma whereas Sigma Corporation also holds 20% of the shares of Intergalactic Corporation. The dividend of $40,000 will be calculated in the dividend amount of Sigma but 20% will be deducted.

$100,000 + $40,000 * 80% = $132,000

6 0
3 years ago
Which of the following factors has the greatest impact in calculating FICO scores? Select one of the options below as your answe
SSSSS [86.1K]
The right answer for the question that is being asked and shown above is that: "c. length of credit history."  the factor that has the greatest impact in calculating FICO scores is that c. length of credit history<span>
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4 0
3 years ago
The following data are available for the Phelps Corporation for a recent month: Product A Product B Product C Total Sales $ 150,
mrs_skeptik [129]

Answer:

$277,000

Explanation:

Break even is the point where neither profit nor a loss is made by the company.

<u>Determination of Break-even Sales</u>

Sales - Variable Expenses - Fixed Expenses = 0

Therefore, Solving Algebraically

Sales = Variable Expenses + Fixed Expenses

         = 222,000 + 55,000

         = 277,000

Therefore Break-even sales for the month for the company is closest to $277,000

5 0
3 years ago
Global Pistons​ (GP) has common stock with a market value of $ 200$200 million and debt with a value of $ 100$100 million. Inves
kvv77 [185]

Answer:

a. Suppose GP issues $ 100$100 million of new stock to buy back the debt. What is the expected return of the stock after this​ transaction?

  • 12%

b. Suppose instead GP issues $ 50.00$50.00 million of new debt to repurchase stock. i. If the risk of the debt does not​ change, what is the expected return of the stock after this​ transaction?

  • 18%

ii. If the risk of the debt​ increases, would the expected return of the stock be higher or lower than when debt is issued to repurchase stock in part ​(i​)?

  • If the risk of the debt increases, then the cost of the debt will increase. Therefore, the company will need to spend more money paying the interests related to the new debt which would decrease the ROE compared to the 18% of (i). Since we do not know the new cost of the debt, we cannot know exactly by how much it will affect the ROE, but I assume it will still be higher than the previous ROE.

Explanation:

common stock $200 million

total debt $100 million

required rate of return 15%

cost of debt 6%

current profits = ($200 million x 15%) + ($100 x 6%) = $30 million + $6 million = $36 million

if equity increases to $300 million, ROI = 36/300 = 12

if instead new debt is issued at 6%:

equity 150 million, debt 150 million

cost of debt = 150 million x 6% = $9 million

remaining profits = $36 - $9 = $27 million

ROI = 27/150 = 18%

3 0
3 years ago
Suppose Brazil has a comparative advantage in coffee production and Mexico has a comparative advantage in tomato production. If
lawyer [7]

Answer:

The correct answer is A. Brazilian tomato producers are worse off.

Explanation:

A country has a comparative advantage in producing a good and service if its opportunity cost of producing that good and service is lower than that of its trading partner. So it is better off for a country that has a lower opportunity cost in production a good or service to specialise in that good or service.

Brazil has a comparative advantage in coffee production, meaning, it is better off in specialising in the production of coffee and will be worse off if Brazil specialises in Tomato

Mexico has a comparative advantage is Tomato, meaning, she is better off in specialising in Tomato and worse off if she specialises in Coffee

6 0
3 years ago
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