Airlines are concerned about the ages of their airplanes. Forty commercial airplanes randomly selected by the airline from the GLEN aviation company have the ages given below. If the true median age of the airplanes is more than 15 years old, the airline will be forced to update half of their airplanes at a great expense. Conduct the appropriate test using an significant value = 0.01. Does the airline need to update their airplanes? Do not assume normality. 3.2 22.6 23.1 16.9 0.4 6.6 15.5 22.8 26.3 8.1 15.6 17.0 21.3 15.2 18.7 11.5 4.9 5.3 5.8 20.6 23.1 24.7 3.6 12.4 27.3 22.5 3.9 7.0 16.2 24.1 0.1 2.1 7.7 10.5 23.4 0.7 15.8 6.3 16.9 16.8

2. A company claims that a certain vitamin contains 100% of your recommended daily allowance of vitamin C. You suspect that they are not putting as much vitamin C as they claim in their vitamins. The standard deviation of percent of daily allowance of vitamin C is 5%. You take an SRS of 5000 vitamins and find the average percent of daily allowance to be 99.8%.

(a) Use the appropriate methods to determine if your fears are true.

(b) Estimate the mean percent of your daily allowance of vitamin C in these vitamins.

(c) Was part (a) statistically significant? Why or why not?

(d) Was part (a) practically significant? Why or why not?

(e) You want to create a confidence interval with a confidence level of 90% and a margin of error no more than 0.7%. What is the smallest sample size you can use and get these requirements?

1. Use the information for securities X, Y and Z in the table below to answer parts a and b.

The risk-free rate is 2% and the expected return of the market portfolio is 8%.

1. According to the CAPM, are these securities overpriced, fairly priced or underpriced?
2. Using the CAPM, calculate the abnormal return of a portfolio that takes a long position in security X by $35,000, a short position in security Y by $15,000, and a long position in security Z by $5,000.
3. You have $100,000 and you want to set up a portfolio of security X and security Y with an abnormal return of 2.7% based on the CAPM. Specify the position to be taken (long or short) and the dollar amount to be invested in each security.

Use the information for securities X, Y and Z in the table below to answer parts a and b:

The risk-free rate is 2% and the expected return of the market portfolio is 8%.

1. According to the CAPM, are these securities overpriced, fairly priced or underpriced?
2. Using the CAPM, calculate the abnormal return of a portfolio that takes a long position in security X by $35,000, a short position in security Y by $15,000, and a long position in security Z by $5,000.
3. You have $100,000 and you want to set up a portfolio of security X and security Y with an abnormal return of 2.7% based on the CAPM. Specify the position to be taken (long or short) and the dollar amount to be invested in each security.

A solar cell fabricated with a p-n junction has an open circuit voltage of 0.6V and a short circuit current of 20mA/cm²when exposed to a solar insolation of 1000 W/m², and has a form factor FF=0.7

1. Draw the current-voltage characteristic of this device, making sure to identify the Voc and Isc, and the point where the maximum power is generated.
2. What is the efficiency of this cell?
3. Suppose you can improve the manufacturing process of the cell so that the carrier life time is increased by 4 times. What will happen to the V_oc and I_sc of the cell? Draw how the current voltage characteristic will change.
4. If the solar insolation of 1000 W/m² is constant for 8 hours per day and then is zero for 16 hours per day what is the capacity factor of this cell? How much electrical energy will it produce in a day?

A 100-mL water sample is collected from the activated sludge process of municipal wastewater treatment. The sample is placed in a drying dish (weight = 0.5000 g before the sample is added), and then placed in an oven at 104°C until all the moisture is evaporated. The weight of the dried dish is recorded as 0.5625 g. A similar 100-mL sample is filtered and the 100-mL liquid sample that passes through the filter is collected and placed in another drying dish (weight of dish before sample is added is also 0.5000 g). This sample is dried at 104°C and the dried dish’s weight is recorded as 0.5325 g. Determine the concentration (in mg/L) of:

(a) total solids,

(b) total dissolved solids,

(c) total suspended solids, and

(d) volatile suspended solids, (Assume that VSS = 0.7 x TSS.)

14.7 Batch and continuous biomass production Pseudomonas methylotrophus is used to produce single cell protein from methanol in a 1000-m3 pressure-cycle airlift fermenter. The biomass yield from substrate is 0.41 g/g, KS is 0.7 mg/l, and the maximum specific growth rate is 0.44 1/h. The medium contains 4% (w/v) methanol. A substrate conversion of 98% is desirable. The reactor may be operated in either batch or continuous mode. If operated in batch, an inoculum of 0.01% (w/v) is used and the downtime between batches is 20 h. If continuous operations are used at steady state, a downtime of 25 days is expected per year. Neglecting maintenance requirements, compare the annual biomass production achieved using batch and continuous reactors.

Required

You are asked to provide the shareholders with an assessment of the firm's asset management ,profitability,efficiency,solvency and leverage .Be as complete as possible given the above information ,but do not use any irrelevant information

3 boxes, having masses m1=5kg, m2=10kg and m3=15 kg are stacked "sideways" (i.e., in x-) on a surface with coefficient of kinetic friction 0.7 mu_k; an external force of magnitude 15 N pushes on the right-most box, making an angle of 30 degrees relative to the horizontal; a second force of magnitude 20 N pushes in the opposite direction on the left-most box, as a result of which all three accelerate uniformly. Determine the numerical value all of the forces acting on each of the boxes (including all normal forces between the boxes), as well as the amount the boxes have moved after a time of 7 seconds. Keep in mind that the normal force acting specifically on the box subject to the external force is changed by the external force...

please make a diagram