In a large university, 20% of the students are male. If a random sample of twenty two students is selected
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a. |
What is the probability that the sample contains exactly twelve male students? |
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b. |
What is the probability that the sample will contain no male students? |
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c. |
What is the probability that the sample will contain exactly twenty female students? |
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d. |
What is the probability that the sample will contain more than nine male students? |
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e. |
What is the probability that the sample will contain fewer than ten male students? |
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f. |
What is the expected number of male students? |
In: Statistics and Probability
imagine that you have information about how 20 nursing students and 20 psychology students felt about starting PSYC 3002 on Day 1 of this class. You want to know if nursing students and psychology students felt differently about embarking on the Introduction to Basic Statistics journey.
Explain whether you should retain or reject the null hypothesis and why.
data set
| 5 Nervous Nursing Students |
| 10 Nervous Psychology Students |
| 15 Excited Nursing Students |
| 10 Excited Psychology Students |
In: Math
The expected return on stock W is 10% and its standard deviation is 15%. Expected return on stock V is 16% and its standard deviation is 24%. The correlation between returns of W and V is 20%.
a) calculate expected return and standard deviation of a portfolio that invests 40% in W and 60% in V.
b) determine the minimum variance combination of W and V and determine its expected return and standard deviation.
c) If the risk-free rate is 4%, determine the tangency portfolio and derive the capital market line equation.
In: Finance
In: Chemistry
A 197 Ω resistor, a 0.925 H inductor, and a 5.75 μF capacitor are connected in series across a voltage source that has voltage amplitude 31.5 V and an angular frequency of 230 rad/s. What is v at t= 19.0 ms? What is vR at t= 19.0 ms? What is vL at t= 19.0 ms? What is vC at t= 19.0 ms? Compare vC+vL+vR and v at this instant. What is VR? What is VC? What is VL? Compare V and VL+VC+VR.
In: Physics
5. For the titration of 50.00 mL of 0.0500 M Ce4+ with 0.1000 M Fe2+ in the presence of 1 M H2SO4, please calculate the system potential while 3.00 mL of Fe2+ is added.
Ce4+ + e <==> Ce3+, E0 = + 1.44 V (in 1 M H2SO4)
Fe3+ + e <==> Fe2+, E0 = + 0.68 V (in 1 M H2SO4).
Answer is 1.49 V
5b) In the above titration, what's the electrode potential after 28.90 mL of Fe2+ is added?
Answer is 0.73 V.
Just wondering, how they got that?
In: Chemistry
•• A meter stick is moving with speed relative to a frame S. (a) What is the stick’s length, as measured by observers in S, if the stick is parallel to its velocity v? (b) What if the stick is perpendicular to v? (c)What if the stick is at to v, as seen in the stick’s rest frame? [HINT: You can imagine that the meterstick is the hypotenuse of a 30–60–90 triangle of plywood.] (d) What if the stick is at 60° to v, as measured in S?
Not hand-writing please (only if it is very clear).
I only need part c and d.
In: Physics
2. A 15-MΩ resistor and a 48-nF capacitor get connected in series to a 15-V battery. a. How long will it be until the capacitor is “fully” charged? b. If the battery is then disconnected from the circuit, how long will it be until the capacitor’s voltage is 9.0 V? What is the charge of the capacitor at that moment? c. If we’d like the capacitor’s voltage in this circuit to decrease from 15-V to 9.0-V in 1.5 seconds after the battery gets disconnected, how should the capacitance of the capacitor change (increase or decrease, and by how much)?
In: Physics
A capacitor of unknown capacitance C is charged to 130 V and connected across an initially uncharged 75 uF capacitor. if the final potential difference across the 75 uF capacitor is 47 V what is C? After you find the value of C, you charge this capacitor C to a potential difference V=140 V between its plates. The charging battery is now disconnected and a slab material ( k=7.20 is slipped between the plates. what is the potential energy of the device, both before and after the slab is introduced?
In: Physics
ive an example of a simple, undirected graph that has a single source shortestpath tree which breadth-first search will not return for any ordering of its vertices.Your answer must
(a) Specify the graphG= (V, E)by specifying V and E.
(b) Specify the single source shortest path treeT= (V, ET) by specifying E T and also specifying the roots∈V.
(c) and include a clear explanation of why the breadth-first search algorithm we discussed in class will never produce T for any orderings of the vertices.
In: Computer Science