Hello, my name is Shelayah Robinson. I'm a college student majoring in software development about to be graduating fairly soon. I enjoy helping students in topics, I'm super passionate about.
A molecule of DNA (deoxyribonucleic acid) is 2.18 ?mlong. The ends of the molecule become singly ionized: negative onone end, positive on the other. The helical molecule acts like aspring and compresses 1.01% upon becoming charged. Determinethe effective spring constant of the molecule.
Which of the following is NOT an assumption for PearsonCorrelations (r)?
Suppose we are interested in bidding on a piece of land and weknow one other bidder is interested. The seller announced that thehighest bid in excess of $10,000 will be accepted. Assume that thecompetitor's bid x is a random variable that is uniformlydistributed between $10,000 and $15,000.(a) Suppose you bid $12,000. What is the probability that yourbid will be accepted? If required, round your answer to two decimalplaces.(b) Suppose you bid $14,000. What is the probability that yourbid will be accepted? If required, round your answer to two decimalplaces.(c) What amount should you bid to maximize the probability thatyou get the property?(d) Suppose you know someone who is willing to pay you $16,000for the property. Would you consider bidding less than the amountin part (c)? Why or why not?(e) What is the bid amount that maximizes expected profit?
The College Board SAT college entrance exam consists of three parts: math, writing and critical reading (The World Almanac 2012). Sample data showing the math and writing scores for a sample of twelve students who took the SAT follow.
a. Use a .05 level of significance and test for a difference between the population mean for the math scores and the population mean for the writing scores. Enter negative values as negative numbers. What is the test statistic? Round your answer to two decimal places.What is the p-value?Use t table. Round your answer to four decimal places.What is your conclusion?
b. What is the point estimate of the difference between the mean scores for the two tests?What are the estimates of the population mean scores for the two tests?Math testWriting testWhich test reports the higher mean score?
The nucleus of a 125Xe atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in diameter. It has 54 protons and charge q=+54e.
PART AWhat is the electric force on a proton 2.6 fm from the surface of the nucleus? Hint: Treat the spherical nucleus as a point charge.Express your answer with the appropriate units.F=?
PART BWhat is the proton's acceleration?Express your answer to two significant figures and include the appropriate units.a=?
Each front tire on a particular type of vehicle is supposed tobe filled to a pressure of 26 psi. Suppose the actual air pressurein each tire is a random variable—X for the righttire and Y for the left tire, with joint pdfgiven below.f(x, y) = K(x2 + y2) 21 ≤ x ≤ 32, 21 ≤ y ≤ 320otherwise(a) Compute the covariancebetween X and Y. (Round youranswer to four decimal places.)Cov(X, Y) = (b) Compute the correlation coefficient p forthis X and Y. (Round your answerto four decimal places.)? =
