In: Other
2. (a) Explain the meaning of the CT specification 200/1, 10 VA, Class 5P10.
(b) When should a CT with a 5 A secondary rating not be used?
(c) Determine the required knee point voltage of a 3 VA CT with a setting of 0.2 A and an Accuracy Limit Factor of 20 (neglect saturation).
(d) What is meant by residually connected CT's?
In: Electrical Engineering
Suppose you believe the strength of the linear association between weight (lbs) and sleep (average per night), r1=-0.2 is significantly different than the association between weight and exercise (hours per week), r2=-.25.
What is the required sample size required to assess whether the two correlations are significantly different? Assume alpha = 0.05 and beta = 0.1.
In: Statistics and Probability
Suppose we are interested in studying whether exposure to a pesticide increases the risk of prostate cancer. Assume that 20% of controls are exposed to the pesticide and we wish to detect an odds ratio of 2.7 from the exposure. Note that p2 = 0.2 and we need to calculate p1. How many cases and how many controls are needed in your case-control study?
In: Statistics and Probability
A guy pushes a box of mass 10kg along an inclined plane of 15.0. The coefficient of kinetic friction is 0.2. The man gives a force of 50N on the box along the inclined plane and the box goes through a displacement of 2m. Find:
a) the net work done on the box
b) if the guy takes 2 minutes to move the box 2m, then find his power
In: Physics
The index model has been estimated for the returns of stocks A
and B, denoted by R_A and R_B, on the return on the market denoted
by R_M, with the following results:
R_A = 0.01 + 0.8R_M + e_A.
R_B = 0.02 + 1.2R_M + e_B.
The standard deviation of market returns is 0.2; the idiosyncratic
risk (standard deviation of e_A) of stock A is 0.10; and that for
stock B is 0.20.
The standard deviation for stock A is
In: Finance
37) A pendulum whose period in a vacuum is 2.3 second is placed in a resistive medium. Its amplitude on each swing is observed to be half that on the previous swing. What is its new period? Given that the pendulum bob is of mass 0.2 kg, and is subjected to a periodic force of amplitude 0.5 N and period 1 s, find the angular amplitude of the resulting forced oscillation.
In: Physics
Thompson and Thompson is a steel bolts manufacturing company. Their current steel bolts have a mean diameter of 143 millimeters, and a standard deviation of 5. If a random sample of 47 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by more than 0.2 millimeters? Round your answer to four decimal places
In: Statistics and Probability
A certain manufactured product is supposed to contain 23% potassium by weight. A sample of 10 specimens of this product had an average percentage of 23.2 with a standard deviation of 0.2. If the mean percentage is found to differ from 23, the manufacturing process will be recalibrated.
a) State the appropriate null and alternate hypotheses.
b) Compute the P-value.
c) Should the process be recalibrated? Explain.
In: Statistics and Probability
An acute viral disease infects a population of chipmunks, and only those homozygous for allele b are resistant. (Those individuals heterozygous or homozygous for allele B are susceptible and suffer 100% mortality).
A. If the initial frequency of allele b=0.2, what is the frequency (ignoring mutation) one generation after the introduction of this disease?
B. What is the mechanism of evolutionary change in this example?
In: Biology