14. An alcohol awareness task force at a Big-Ten university sampled 200 students after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following result was obtained. (Please show the calculation process)
|
Did Well on Midterm |
Did Poorly on Midterm |
|
|
Studying for Exam |
80 |
20 |
|
Went Bar Hopping |
30 |
70 |
Referring to above table, what is the probability that a randomly selected student did well on the midterm and went bar hopping the weekend before the midterm?
15. What is the probability that a randomly selected student did well on the midterm or went bar hopping the weekend before the midterm?
16. Referring to above table, the events "Did Well on Midterm" and "Studying for Exam" are
In: Statistics and Probability
Oil (ρ = 925 kg/m3) is flowing through a pipeline at a constant speed when it encounters a vertical bend in the pipe raising it 4.0 m. The cross-sectional area of the pipe does not change.
a) What is the speed of the fluid at Point B?
b) What is the difference in pressure (PB – PA) in the portions of the pipe before and after the rise?
In: Physics
#1. Heparin is a polyanionic polysaccharide that blocks initiation by RNA polymerase by virtue of its binding to double stranded DNA. However, Heparin inhibits only when added before the onset of transcription, and not if added after transcription begins. Explain the difference.
#2. Describe how RNA Polymerase backtracking could function to increase the fidelity of transcription.
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Calculate the pH of 100.0 mL of a buffer that is 0.0850 M NH4Cl and 0.180 M NH3 before and after the addition of 1.00 mL of 5.50 M HNO3.
Can you please do a step-by-step of how to solve this, paying special attention to how to get the Ka in the Henderson Hasselbalch Equation? That's the part I'm not understanding.
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Provide a brief history of Standard Oil Co Inc (owned by John D. Rockerfeller) and of how antitrust issues led to its break up; discuss the market structure both before and after the break up(i.e., using the characteristics of market structures); explain how the nature of goods and services the firm provides to the marketplace have changed.
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Calculate the pH of 0.305 L of a 0.17 M acetic acid - 0.28 M sodium acetate buffer before (pH1) and after (pH2) the addition of 0.0062 mol of HBr. Assume that the volume remains constant. (Ka of acetic acid is 1.8⋅10−5)
Express your answers using three significant figures separated by commas.
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A family took a 20 year mortgage of $195,000 at 5.75% per year compounded monthly. Immediately after the 85th monthly payment, they decided to re-finance this mortgage because they found a lower rate of 3.75% per month compounded monthly. If they continue the same amount of monthly payments as before, how long will it take to pay off this mortgage?
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A family took a 20 year mortgage of $195,000 at 5.75% per year compounded monthly. Immediately after the 85th monthly payment, they decided to re-finance this mortgage because they found a lower rate of 3.75% per month compounded monthly. If they continue the same amount of monthly payments as before, how long will it take to pay off this mortgage?
In: Economics
1)A 21.7 mL sample of 0.267 M dimethylamine, (CH3)2NH, is titrated with 0.241 M perchloric acid. The pH before the addition of any perchloric acid is
2)A 27.1 mL sample of 0.212 M dimethylamine, (CH3)2NH, is titrated with 0.201 M hydroiodic acid. After adding 40.6 mL of hydroiodic acid, the pH is
In: Chemistry
Suppose we titrate 20.0 mL of 0.100 M HCHO2 (Ka = 1.8 × 10–4) with 0.100 M NaOH. Calculate the pH. Before any base is added: pH = When half of the HCHO2 has been neutralized: pH = After a total of 15.0 mL of base has been added: pH = At the equivalence point: pH =
In: Chemistry