Chapter 6, Section 4-D, Exercise 180

Use the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2. Samples of size 115 from Population 1 with mean 90 and standard deviation 14 and samples of size 90 from Population 2 with mean 73 and standard deviation 16 Round your answer for the standard error to two decimal places.

Consider the mixed streams of cash flows shown in the following? table

1)Find the present value of each stream using a 16?%discount rate.

2)?Compare the calculated present values and discuss them in light of the undiscounted cash flows totaling ?$175,000 in each case

1   $52,500   $17,500
2   $43,750   $26,250
3   $35,000   $35,000
4   $26,250   $43,750
5   $17,500   $52,500
Totals   $175,000   $175,000

1. A project that costs $26,000 today will generate cash flows of $9,000 per year for seven years. What is the project's payback period?

2.Living Colour Co. has a project available with the following cash flows:

Q\ the following table refer to student’s mark in math, find the following: -
1- Arithmetical Mean
2- Geometric Mean
3- Harmonic Mean
4- Weight Mean
(note consider frequency = weight)
5- Median
6- Mode

4. (10pts) Consider the damped forced harmonic oscillator with mass 1 kg, damping coefficient 2, spring constant 3, and external force in the form of an instantaneous hammer strike (Section 6.4) at time t = 4 seconds. The mass is initially displaced 2 meters in the positive direction and an initial velocity of 1 m/s is applied. Model this situation with an initial value problem and solve it using the method of Laplace transforms.

1. Consider the following table which shows different baskets of golf balls:

(a) List all samples of size 2, and compute the mean of each sample.

(b) Compute the mean of the distribution of the sample mean and the population mean. Compare the two values.

(c) Compare the dispersion in the population with that of the sample mean

Probability and Statistics

Write a Matlab simulation to solve problem 2.4.4.

2.4.4.

Each problem has a failure probability q, independent of any other component. A successful operation requires:

1. components 1, 2, and 3 all work, or 4 works

2. component 5 or component 6 works.

with q = 0.2, simulate the replacement of a component with an ultrareliable component. For each replacement of a regular component, perform 100 trials.

Animal Nutrition Questions:

5) List and explain four nutritional or immunological differences between milks from a female mammal that has an epitheliochorial placenta and an altricial baby verses a female that has a haemochorial placenta and a precocial baby?

1)

2)

3)

4)

6) List 3 strategies for nutritional support to improve exercise performance of an animal. For each one, give the metabolic/physiologic basis.

1)

2)

3)

Consider the following information on returns and probabilities:

Invest 1/2 of your money in Asset A and 1/2 in Asset B.

State      Probability           A             B                           

Boom         .25                   12%       4%         

Bust            .75                   6%         18%      

what is the standard deviation of the return on the portfolio?

Consider the following portion of the energy-level diagram for hydrogen:

In the hydrogen spectrum, what is the wavelength of light associated with the n = 2 to n = 1 electron transition? Please explain. The answer is: 1.22 × 10^–7 m.