The worldwide sales of cars from 1981-1990 are shown in the table below. Given: α = 0.2 and β = 0.15 (Hint: Use XLMiner) Year Units sold in thousands 1981 888 1982 900 1983 1000 1984 1200 1985 1100 1986 1300 1987 1250 1988 1150 1989 1100 1990 1200 Using the double exponential smoothing, find the value of the root mean square error for the given data.

1. Given the following pmf f(x,y), calculate m_x, m_y, s_x, s_y, s_xy, p_xy, and E[2.5x²-10y³-8x³y²+3]

x2 is the same as x^2, and x3 is  x^3,y2 is y^2

Suppose a TCP client needs to send 3 packets to the TCP server. Before sending the first packet, the estimated RTT is 50 ms, and the estimated deviation of the sample RTT is 10 ms. The parameters α= 0.1, and β = 0.2. The measured sample RTT for the three packets are 60ms, 70 ms, and 40 ms, respectively. Please compute the time out value that was set for each packet right after it is being transmitted out.

The amount of corn chips dispensed into a 10-ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 10.5 ounces and a standard deviation of 0.2 ounces (these are the population parameters). Suppose a sample of 100 bags of chips were randomly selected from this dispensing machine. Find the probability that the sample mean weight of these 100 bags exceeded 10.6 ounces. (Hint: think of this in terms of a sampling distribution with sample size = 100)

Two equal-length springs are “nested” together in order to form a shock absorber. If it is designed to arrest the motion of a 2-kg mass that is dropped above the top of the springs from an at-rest position, and the maximum compression of the springs is to be 0.2 m, determine the required stiffness of the inner spring, K B if the outer spring has a stiffness k A = 400 N/m

(s) is unknown, please will you show all the working out. Thank you

There are 2567 students enrolled at a small college, with 2053 of them enrolled in a sociology course.

In the sampling distribution of sample proportions of size 230, above what proportion will 52% of all sample proportions be?

Select all answers that apply to your calculation below. Use the z-table given below to answer the question:

Select all that apply:

• z=0.05

• z=−0.05

• z=−0.01

• p̂ =0.80

• p̂ =0.32

• p̂ =0.75

You now set up a ligation reaction with the following components: • Plasmid Vector (0.05 µg/µL) • Insert DNA (0.2 µg/µL) • 10X Ligase Buffer • Water Because you are unsure what the best ratio of insert to plasmid is, as this is a new experiment for you, you plan to set up two experiments, one with a 3:1 ratio of insert to plasmid, and one with a 6:1 ratio of insert to plasmid. In both cases the amount of plasmid vector to be used in total will be 0.1 µg. The final reaction volume will be 20 µL. The final concentration of the 10X ligase buffer should be 1X. Using this information, complete the following chart regarding the volumes of each component used to prepare your samples. (Hint: For the plasmid and insert, determine the mass of DNA that needs to be in each tube using the information given, then use the equation C=mass/V to solve for the volume.) Ratio Volume of 0.05 µg/µL Plasmid Vector (µL) Volume of 0.2 µg/µL Insert DNA (µL) Volume of 10X Ligase Buffer (µL) Volume of Water (µL) Total Volume 3:1 20 µL 6:1 20 µL.

Suppose you and most other investors expect the inflation rate to be 7% next year, to fall to 5% during the following year, and then to remain at a rate of 3% thereafter. Assume that the real risk-free rate, r , will remain at 2% and that maturity risk premiums on Treasury securities rise from zero on very short-term securities (those that mature in a few days) to a level of 0.2 percentage points for 1-year securities. Furthermore, maturity risk premiums increase 0.2 percentage points for each year to maturity, up to a limit of 1.0 percentage point on 5-year or longer-term T-notes and T-bonds.

a. Calculate the interest rate on 1-, 2-, 3-, 4-, 5-, 10-, and 20-year Treasury securities, and plot the yield curve.

b. Now suppose ExxonMobil’s bonds, rated AAA, have the same maturities as the Treasury bonds. As an approximation, plot an ExxonMobil yield curve on the same graph with the Treasury bond yield curve. (Hint: Think about the default risk premium on ExxonMobil’s long-term versus short-term bonds.)

c. Now plot the approximate yield curve of Long Island Lighting Company, a risky nuclear utility.

Use the approximation that v→avg=p→f/m for each time step.

A paddle ball toy consists of a flat wooden paddle and a small rubber ball that are attached to each other by an elastic band (figure). You have a paddle ball toy for which the mass of the ball is 0.014 kg, the stiffness of the elastic band is 0.890 N/m, and the relaxed length of the elastic band is 0.325 m. You are holding the paddle so the ball hangs suspended under it, when your cat comes along and bats the ball around, setting it in motion. At a particular instant the momentum of the ball is <−0.02, −0.01, −0.02 > kg·m/s, and the moving ball is at location <−0.2, −0.61, 0> m relative to an origin located at the point where the elastic band is attached to the paddle.

(a) Determine the position of the ball 0.1 s later, using a Δ⁢t of 0.1 s. (Express your answer in vector form.)

(b) Starting with the same initial position (<−0.2, −0.61, 0> m) and momentum (<−0.02, −0.01, −0.02 > kg·m/s) determine the position of the ball 0.1 s later, using a Δ⁢t of 0.05 s. (Express your answer in vector form.)

The time series showing the sales of a particular product over the past 12 months is contained in the Excel Online file below. Construct a spreadsheet to answer the following questions.

1. Use a=0.2 to compute the exponential smoothing forecasts for the time series (to 2 decimals).

   Month	Time-Series Value	Forecast
   1	105
   2	130
   3	125
   4	100
   5	90
   6	120
   7	150
   8	135
   9	95
   10	75
   11	100
   12	105
   13

2. Use a smoothing constant of a=0.5 to compute the exponential smoothing forecasts (to 2 decimals).

   Month	Time-Series Value	Forecast
   1	105
   2	130
   3	125
   4	100
   5	90
   6	120
   7	150
   8	135
   9	95
   10	75
   11	100
   12	105
   13

   Compute MSE (to 2 decimals).

   MSE ( a= 0.2 ) : (___)
   MSE ( a = 0.5) : (___)