Justify selection of a non-destructive testing method to be used for inspection of welds on a 3m high 2m diameter steel storage tank on a remote worksite.
In: Mechanical Engineering
The fermi function value is non zero within the band gap of a semiconductor. if the fermi level is within the band gap. Do you expect electrons or holes to populate
energy states within the band gap? If yes, why? If not, why?
In: Physics
A random sample of non-English majors at a selected college was used in a study to see if the student retained more from reading a 19th-century novel or by watching it in DVD form. Each student was assigned one novel to read and a different one to watch, and then they were given a 100-point written quiz on each novel. The test results are shown. Book 90 80 90 75 80 90 84 DVD 95 82 80 80 70 85 90 Use a 0.05 significance level to test the claim that the students score higher after watching the DVD.
1.Find the P-value.
2.Based on the P-value found , state your conclusion about the null hypothesis.
3.Based on your conclusion, state the conclusion about the claim.
4.Construct the 90% confidence interval to estimate the mean differences of the scores.
5.Based on the confidence interval, state the conclusion about the means.
In: Statistics and Probability
8. Definition: A set A is finite if there exists a non-negative integer c such that there exists a bijection from A to {n ∈ N : n ≤ c}. (The integer c is called the cardinality of A.)
(a) Let A be a finite set, and let B be a subset of A. Prove that B is finite. (Hint: induction on |A|. Note that our proof can’t use induction on |B|, or indeed refer to “the number of elements in B” at all, because we don’t yet know that B is finite!)
(b) Prove that the union of two disjoint finite sets is finite.
(c) Prove that the union of any two finite sets is finite. (Hint: A ∪ B = A ∪ (B − A))
In: Advanced Math
Imagine you are the manager of a non-profit business, and you are looking to hire a recent college graduate. You list the position as paying $20,000/year. After interviewing candidates you decide that some will be offered the expected salary, while some will be offered more because of experience and interviewing skills. Others will be offered less than expected until they can demonstrate competence and their salary will increase when they are fully qualified.
Using Microsoft® Excel®, run a chi square Goodness of Fit test to determine whether these observed starting salaries are significantly different. What do the findings tell you?
Write a 75- to 100-word summary to describe your results.
Paste your Microsoft® Excel® output below your summary.
|
Expected Salaries |
Observed Salaries |
|
|
Applicant 1 |
$20,000 |
$17,500 |
|
Applicant 2 |
$20,000 |
$20,000 |
|
Applicant 3 |
$20,000 |
$22,000 |
|
Applicant 4 |
$20,000 |
$20,500 |
|
Applicant 5 |
$20,000 |
$20,000 |
In: Statistics and Probability
Let A be a non-negative random variable (A>0)
a) If A is discrete, show that E[A] >= 0
b) If A is continous , show E[X]>=0
In: Statistics and Probability
With the following questions mark whether each is non-reasoning or reasoning. If "reasoning," then:
1. Circle indicator words and/or phrases
2. Mark off and number the statements
3. Paraphrase and list the statements
4. Identify the main conclusion
The World Bank has recently estimated the number of people in absolute poverty in the Third World at around 780 million. Half of them are in South Asia. The other half lives in East Asia, sub-Saharan Africa, Latin America, North Africa and the Middle East. Roughly 80 percent of these poor live in the countryside, mostly as small farmers and landless laborers. Poverty is thus an essentially rural phenomenon.
________ Non-reasoning ________ Reasoning
In the first place, we may start with the strong presumption that Colonel Openshaw had some very strong reason for leaving America. Men at his time of life do not change all their habits, and exchange willingly the charming climate of Florida for the lonely life of an English provincial town. His extreme love of solitude in England suggests the idea that he was in fear of someone or something, so we may assume as a working hypothesis that it was fear of something or someone which drove him from America.
Sherlock Holmes in "The Five Orange Pips" by Sir Arthur Conan Doyle
________ Non-reasoning ________ Reasoning
In: Finance
11. Which of the following is NOT a non-covalent bond that gives form to proteins ?
(A) H-bond (B) ionic bond (C) disulfide bridge (D) van der Waals interactions
12. Which of the following would prevent transcription of the lactose operon?
(A) lactose (B) allolactose (C) tryptophan (D) glucose
13. Which of the following would prevent transcription of the tryptophan operon?
(A) lactose (B) allolactose (C) tryptophan (D) glucose
In: Biology
1a.) If two events A and B are non-overlapping, then the formula for computing the probability of theirunion is: ?(?) + ?(?) . This statement is true or false?
1b.) A survey of 1,000 adults in a small town gave the following data. Round answers to the nearest tenth of a percent.
If an adult in the town is selected at random, find the probability that: a.) The adult is either female or employed.
b.) The adult is neither male nor employed.
c.) The adult is female, given the adult is unemployed.
d.) The adult is unemployed, given the adult is female.
|
Employed |
Unemployed |
Total |
|
|
Male |
510 |
40 |
550 |
|
Female |
190 |
260 |
450 |
|
Total |
700 |
300 |
1,000 |
In: Statistics and Probability
Create a CubesSum application that prompts the user for a non-negative integer and then displays the sum of the cubes of the digits.
b) Modify the application to determine what integers of two, three, and four digits are equal to the sum of the cubes of their digits.(Java Programming )
In: Computer Science