Question thank. you for help 8). A 99% confidence interval for the population mean y is determined to be (65.32 to 73.54). If the confidence level is reduced to 90%, the 90% confidence interval for å A. becomes wider B. becomes narrower C. remains unchanged D. None of the above answers are correct.

You can use both the t statistic and the z statistic to test hypotheses about the mean of population. The test that uses the t statistic is typically referred to as a t test, while the test that uses z statistic is commonly called a z test. Which of the following statements are true of the t statistic? Check all that apply. The numerator of the t statistic is different than the numerator of the z statistic. When you do not know the population standard deviation, you can use the t statistic, assuming all relevant assumptions are satisfied. The t statistic provides an increasingly bad estimate of z at increasingly large sample sizes. The formula for the t statistic is t = (M - u) / SM With the exception of whether the population standard deviation is known, the necessary assumptions for hypothesis tests with the t statistic and with the z statistic are

What should be the minimum cross-sectional area of each conductor in a two-core cable 100 m long to limit the total voltage drop to 4% of the declared voltage of 250V when the conductors carry 60A ? The resistivity of the conductor is 2·845 µΩ cm. ANS IS [0·34 cm2]

Calculate the fermi energy of a good conductor which has number of conduction unit electrons per volume = 5.9× 10 28 /m 3 7.06 eV 5.54 eV 11.6 eV 2.21 eV Calculate the fermi energy of a good conductor which has number of conduction unit electrons per volume = 5.9× 10 28 /m 3 7.06 eV 5.54 eV 11.6 eV 2.21 eV

Consider the quadric surface given by 314 22 – 216 x y - 48 x z + 404 y2 + 72 yz +250 22 = 3025 (a) Express this equation in the form x? Ax = 3025 where A isa symmetric matrix and x = y Enter the matrix A in the box below a ab sina 8 a 12 E aac (b) You are given that the matrix A has eigenvalues 242, 242 and 484. Hence the equation of the surface in terms of its principal exes X, Y and Z can be written as 242 x 2 +242 Y2 + 484 22 = 3025 Enter the shortest distance, in Maple syntax, from the origin to the surface in the box below. Note: Use sqrt command when necessary.

Consider the function below. f(x) = 4x tan x, −π/2 < x < π/2 (a) Find the vertical asymptote(s). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) x = Find the horizontal asymptote(s). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) y =

OME COMMENT VIEW FORN PROTECT SHARE HEL Text Annetaion esign form fBeldse CONCEPTS 1-E RETURN ON INVESTMENT IN ACTION Many companies are undergoing the return on investment can be a challenge. Some server virtualization. This is the concept of putting multi companies have lost money on server virtualization, ple 'virtual" servers onto one physical device. OME COMMENT VIEW FORN PROTECT SHARE HEL Text Annetaion esign form fBeldse CONCEPTS 1-E RETURN ON INVESTMENT IN ACTION Many companies are undergoing the return on investment can be a challenge. Some server virtualization. This is the concept of putting multi companies have lost money on server virtualization, ple 'virtual" servers onto one physical device. The pay while most would say that they have gained a positive offs can be significant: fewer servers, less electricity, less return on investment but have not really quantified the generated heat, less air conditioning, less infrastructure results and administration costs, increased flexibility, less physical presence (that is, smaller server rooms), faster mainte QUESTIONS: nance of servers, and more. There are costs, of course, 1. How might a company really determine the return on such as licensing the virtualization software, labor costs investment for server virtualization? in establishing the virtual servers onto a physical device, 2. Is this a project that a systems analyst might be involved labor costs in updating tables, and access. But determining in? Why or why noti 1679% Type here to search 圈目。