I ran some test about something truly exciting and found that for Group A, the sample meanis 8.5, the standard deviationis 0.6, for n = 12. For Group B, the sample meanis 7.7, the standard deviationis 0.8, and n = 15. Use these values (which you will need to manipulate to suit your needs!) for #1-3. Yes, this is all the info you need!
1. Calculate the effect size using Cohen’s d.
2. Calculate the amount of variance accounted for using r2.
3. Construct a 95% confidence interval to estimate the true difference between the groups. Is there one?
In: Math
The demand for Greta’s Grinders can be characterized by the following point elasticities: price elasticity = -0.8, cross-price elasticity with Melvin’s Mashers = -2, and income elasticity = 1.2. Which of the following statements is false?
In: Economics
A high grade semi-anthracite coal has a complete analysis of
85.86% C, 4.44% H, 2.7% O, 1.2% N, 5% ash and 0.8% S. Analysis of
the Residue shows 58% C and 42% ash. Air is
supplied dry at 30°C and 750mmHg. Partial orsat analysis of the
stack gas (400°C, 755mmHg) shows 8.05% CO2, 2.42% CO and
2.9%H2.Assume the S and N gasified burns to SO2 and NO
respectively. Calculate
a. % excess O2
b. Complete orsat analysis of stack gas
c. m3 stack gas/ m3 air
In: Other
In: Electrical Engineering
You want to evaluate three mutual funds using the Jensen measure for performance evaluation. The risk-free return during the sample period is 6%, and the average return on the market portfolio is 18%. The average returns, standard deviations, and betas for the three funds are given below.
| Average Return | Residual Standard Deviation | Beta | ||||||||||
| Fund A | 17.6 | % | 10 | % | 1.2 | |||||||
| Fund B | 17.5 | % | 20 | % | 1.0 | |||||||
| Fund C | 17.4 | % | 30 | % | 0.8 | |||||||
The fund with the highest Jensen measure is
Multiple Choice
Fund A.
Fund B.
Fund C.
Funds A and B (tied for highest).
Funds A and C (tied for highest).
In: Finance
10 kg of gaseous oxygen is compressed in a piston-cylinder device from an initial state of 0.8 m^3/kg, 25 C to a final state of 0.1 m^3/kg, 287 C, with all heat transfer taking place with the surroundings at 25 C. If the process is reversible, determine:
a) the work done in the process;
b) the overall heat transfer to the oxygen; and
c) the change in entropy of the oxygen and of the surroundings
I struggle a lot with thermodynamics, could you please show all work and if possible state the names of equations used. I will rate! Thank you.
In: Mechanical Engineering
If possible, could you write out the process of these problems? include a drawn normal distribution with shading please.
1. suppose X-N (4, 2) what value of x is 1.5 standard
deviations to the left of the mean?
2. Suppose X-N (15,3) between what x values does 68.27% of the data
lie? The range of x values is centered at the mean the distribution
(i.e., 15)
3. X-N (54,8) find the probability that x>56
4. height and weight are two measurements used to
track a child's development. The World Health Organization measures
a child's development by comparing the weights of children who are
the same height and same gender. In 2009 Weights For All 80cm girls
in the reference population at a mean of 10.2 kg and a standard
deviation of 0.8 kg. X-N (10.2, 0.8). Weights are normally
distributed. calculate the Z scores that correspond to the
following weights and interpret them.
a. 11 kg b. 7.9kg c. 12.2 kg
5. Facebook provides a variety of statistics on this website that detailed growth in popularity of the site. On average, 28% of 18 to 35 year olds check their Facebook profile before getting out of bed in the morning. Suppose this percentage follows a normal distribution with standard deviation of 5%. A. find the probability that the percent of 18 to 35 year olds to check Facebook before getting out of bed in the morning is at least 30. B. Find the 95th percentile and express it in a sentence.
In: Statistics and Probability
Anemia (low healthy blood cells or hemoglobin) has an important role in exercise performance. However, the direct link between rapid changes of hemoglobin and exercise performance is still unknown. A study investigated 18 patients with a blood disorder (beta-thalassemia). Participants in the study performed an exercise test before and the day after receiving a blood transfusion. Data are given in the table.
|
ID |
Change in HB |
Obese |
RER > 1.1 |
|
1 |
-1.4 |
No |
No |
|
2 |
-1.5 |
No |
No |
|
3 |
-2 |
No |
Yes |
|
4 |
-2.1 |
No |
No |
|
5 |
-1.9 |
Yes |
Yes |
|
6 |
-1.6 |
Yes |
No |
|
7 |
-1.8 |
No |
Yes |
|
8 |
-0.8 |
No |
Yes |
|
9 |
-1 |
No |
No |
|
10 |
-1.2 |
No |
Yes |
|
11 |
-0.8 |
No |
No |
|
12 |
-1.5 |
Yes |
No |
|
13 |
-1.4 |
No |
Yes |
|
14 |
-2.6 |
No |
Yes |
|
15 |
-1.7 |
No |
Yes |
|
16 |
-2.6 |
No |
Yes |
|
17 |
-2.7 |
Yes |
No |
|
18 |
-1.5 |
Yes |
No |
1. Researchers are interested if the distribution of values for the change in HB (Hemoglobin) follows the pattern where 1/3 of the time the decrease is less than or equal to 1 (HB ≥ -1), 1/3 of the time the decrease is between 1 and 2 (-2 <HB <-1), and 1/3 the time the decrease is greater than or equal to 2 (HB ≤ -2). From our sample what can you conclude?
a. state the null hypothesis
b. which test statistic would you use and what is the observed value
c. which conclusion would you reach (justify)?
In: Statistics and Probability
In: Accounting
Miller Toy Company manufactures a plastic swimming pool at its Westwood Plant. The plant has been experiencing problems as shown by its June contribution format income statement below:
| Flexible Budget | Actual | ||||||
| Sales (3,000 pools) | $ | 175,000 | $ | 175,000 | |||
| Variable expenses: | |||||||
| Variable cost of goods sold* | 24,300 | 58,310 | |||||
| Variable selling expenses |
10,000 |
10,000 | |||||
| Total variable expenses |
34,300 |
68,310 | |||||
| Contribution margin |
140,700 |
106,690 | |||||
| Fixed expenses: | |||||||
| Manufacturing overhead | 50,000 | 50,000 | |||||
| Selling and administrative | 65,000 | 65,000 | |||||
| Total fixed expenses |
115,000 |
115,000 | |||||
| Net operating income (loss) | $ | 25,700 | $ |
(8,310 |
) | ||
*Contains direct materials, direct labor, and variable manufacturing overhead.
Janet Dunn, who has just been appointed general manager of the Westwood Plant, has been given instructions to “get things under control.” Upon reviewing the plant’s income statement, Ms. Dunn has concluded that the major problem lies in the variable cost of goods sold. She has been provided with the following standard cost per swimming pool:
| Standard Quantity or Hours | Standard Price or Rate |
Standard Cost | ||||
| Direct materials | 3.0 pounds | $ |
2.00 |
per pound | $ | 6.00 |
| Direct labor | 0.3 hours | $ |
6.00 |
per hour | 1.80 | |
| Variable manufacturing overhead | 0.2 hours* | $ |
1.50 |
per hour |
0.30 |
|
| Total standard cost per unit | $ | 8.10 | ||||
*Based on machine-hours.
During June the plant produced 3,000 pools and incurred the following costs:
Used 8,800 pounds of materials in production. (Finished goods and work in process inventories are insignificant and can be ignored.)
Worked 2,000 direct labor-hours at a cost of $5.70 per hour.
Incurred variable manufacturing overhead cost totaling $1,710 for the month. A total of 900 machine-hours was recorded.
It is the company’s policy to close all variances to cost of goods sold on a monthly basis.
Required:
1. Compute the following variances for June:
a. Materials price and quantity variances.
b. Labor rate and efficiency variances.
c. Variable overhead rate and efficiency variances.
2. Summarize the variances that you computed in (1) above by showing the net overall favorable or unfavorable variance for the month.
In: Accounting