Numerade

Questions asked

BEST MATCH

You are investigating whether polio vaccination rates have changed over a 10-year period in a particular country. You obtain a random sample of 60 districts in the country, and find that the vaccination rate has decreased in 20 of them, and increased in 40 of them. (There were no districts in which the vaccination rate had not changed.) a) What proportion of observed districts showed an increase in vaccination rates? Answer: b) Assuming across the country there had been no real change in vaccination rates over the 10-year period, what would be the probability of observing a district with a positive change? Answer: c) Using a binomial test, you find the probability of observing 40 or more positive changes (or 20 or fewer negative changes), when the true vaccination rate has not changed, is 0.0135. What can you conclude about the change in vaccination rates? Answer: d) What is the observed significance level for the test that the vaccination rate has not changed? Answer:

View Answer

BEST MATCH

ABC media company published 4 magazines for the teenage market. The executive editor of the company would like to know whether readership preference for the 4 magazines is independent of gender. A survey among 190 teenagers was carried out. The following contingency table was obtained. Magazine preference Gender Beat Youth Grow Line Girls 18 12 20 18 Boys 38 26 34 24

View Answer

BEST MATCH

Differentiate the following function: $v = t^2 + \frac{-5}{\sqrt[4]{t^3}}$

View Answer

BEST MATCH

Find the equation of the quadratic function whose graph is a parabola containing the points (-3,31), (1, -1), and (2,1). The equation of the quadratic function whose graph is a parabola containing the given points is y = \boxed{\text{ }} (Type an expression using x as the variable.)

View Answer

BEST MATCH

If cells are infected with a vesicular stomatitis virus (VSV) strain in which a viral gene (VSVG) is fused to the green fluorescent protein gene, when the chimeric protein is synthesized, what compartments will it visit and in what order before it leaves the cell? A. Golgi, vesicle, RER, vesicle, plasma membrane B. Ribosome, vesicle, Golgi, ER, vesicle, plasma membrane C. SER, vesicle, Golgi complex, vesicle, plasma membrane D. Ribosome, lysosome, ER, Golgi, vesicle, plasma membrane E. RER, vesicle, Golgi complex, vesicle, plasma membrane

View Answer

BEST MATCH

$\int_0^1 \int_{x^2}^x f(x, y) dydx = \int_{x^2}^x \int_0^1 f(x, y) dxdy$ True False

View Answer

BEST MATCH

Consolidate the revenues above into an equivalent amount in today's money. NEW Problem #2 An owner of a building expects the present roof to last nine more years and it will need replacement at the end of year nine (EOY9). Anticipating this expenditure five years ago, the owner began depositing$1000 per year into an interest bearing account of 6% (nominal annual rate) per year. It is now the end of the fifth year and the deposit has just been made. The bank announces that beginning today, all funds on deposit will bear an annual Interest of 7%. The owner realizes that the costs of replacement are increasing, decides to raise the amount to annual deposit of $2000 beginning with the deposit due one year from today. As advisor to the Owner you are requested to calculate how much the account will total at the end of nine more years, assuming the deposits remain at $2000 per year and earning an annual interest rate of 7%.

View Answer

BEST MATCH

10.36 ** A rigid body consists of three equal masses ($m$) fastened at the positions ($a$, 0, 0), (0, $a$, 2$a$), and (0, 2$a$, $a$). (a) Find the inertia tensor $I$. (b) Find the principal moments and a set of orthogonal principal axes.

View Answer

BEST MATCH

7.49 Given $x[n] = \{1, 4, 3, 2, 5, 7, -45, 7, 5, 2, 3, 4, 1\}$, compute the following: (a) $X(e^{j\pi})$ (b) $|X(e^{j\Omega})|$ (c) $\int_{-\pi}^{\pi} X(e^{j\Omega}) \,d\Omega$ (d) $\int_{-\pi}^{\pi} |X(e^{j\Omega})|^2 \,d\Omega$

View Answer

BEST MATCH

Problem 2: (3 pts) A point charge Q is located in air at a height h above a grounded conducting plane. (a) Use the method of images to sketch an equivalent problem for finding the fields above the grounded plane. (b) Find the total induced charge on the plane. (c) What is the electric force on the point charge due to the induced surface charges on the plane?

View Answer

charles s.