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George performed a hypothesis test. Luis checked George's

Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi ISBN: 9780073401331 38

Solution for problem 6E Chapter 6.2

Statistics for Engineers and Scientists | 4th Edition

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Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi

Statistics for Engineers and Scientists | 4th Edition

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Problem 6E

Problem 6E

George performed a hypothesis test. Luis checked George's work by redoing the calculations. Both George and Luis agree that the result was statistically significant the 5% level, but they got different P-values. George got a P-value of 0.20 and Luis got a P-value of 0.02.

a. Is is possible that George's work is correct? Explain.

b. Is is possible that Luis's work is correct? Explain.

Step-by-Step Solution:
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CBIO2210 Notes 3/29/16 Mechanisms of Urine Formation 2 main events (filtration and reabsorption/secretion) 1. Glomerular filtration 2. Tubular reabsorption a. Returns all glucose and amino acids to the plasma (keeps from losing nutrients) b. returns 99% of water, salt, and other components (keeps from dehydrating) 3. Tubular secretion a. reverse of reabsorption: selective addition of plasma components to urine Glomerular Filtration  Passive, mechanical process driven by hydrostatic pressure o Like straining pasta o Hydrostatic pressure is the pressure of the blood trapped inside the tube (like hose with holes in it with water spraying out)  The glomerulus is a very efficient filter because: (high pressure and high surface area) o its filtration membrane is very permeable and has a large surface area o glomerular blood pressure is higher (60 mm Hg) than other capillaries (~ 35 mm Hg)  Molecules >3 nm are not filtered (e.g., plasma proteins) and function to maintain a colloid osmotic pressure in the plasma o Protein should not be able to get through Glomerular Filtration Rate (GFR)  GFR = volume of filtrate formed by the kidneys in one minute o normal ranges:  120-125 ml/min for males  105-110 ml/min for females  These numbers mean filtration process is good/ healthy  What factors affect and control this amount of filtrate o total surface area available for filtration (decreases with diseases such as glomerulonephritis) o permeability of the filtration membrane (size or charge of filtration slit diaphragms, size of podocyte foot processes) o most significant = net filtration pressure  Blood hydrostatic pressure-colloid osmotic pressure-capsular pressure=net filtration pressure  COP (caused by albumin in plasma) and CP(pressure that fluid in capsule has-why kidneys have to keep the BP up) both try to draw the fluid back in  Albumin made in liver and people with liver issues are very susceptible to low albumin levels so they will lose excess fluid (can look like kidney disease, but not) Regulation of GFR  GFR is tightly controlled by mechanisms both within the kidney and without  Intrinsic controls (aka, “renal autoregulation”) o kidney itself regulates (increase or decrease) GFR despite changes in systemic BP o even with fluctuations of MAP between 80-180 mm Hg, the GFR can be kept constant  Extrinsic controls o nervous and endocrine mechanisms that maintain systemic BP, indirectly affecting GFR o remember relationship: BP ➙ NFP ➙ GFR Intrinsic Controls  Myogenic mechanism o vascular smooth muscle has a tendency to contract when stretched (JG = smooth wrapped around afferent arteriole-keeps too much high pressure blood from entering) o ⇧ BP ➙ stretch of afferent arterioles ➙ constriction of arterioles ➙ restricting blood flow into glomerulus (⇩ GFR)  protects glomerular vessels from damaging effects of high BP o ⇩ BP ➙ less stretch ➙ dilation of afferent arterioles ➙ increased blood flow into glomerulus (⇧ GFR)  maintains GFR (even when exercising) by keeping NFP in normal range even with a reduction of systemic BP o (don’t need to know other two bullets) Extrinsic Controls  When blood losses are so significant and intrinsic mechanisms are not adequate to maintain GFR, sympathetic hormones (Epi/NE) are released o cause constriction of afferent arterioles  recall that this is actually as systemic response to stress (i.e., stress increases BP)  its function is to save your life in the event of significant blood loss (shock) o inhibit filtration (reduce plasma fluid loss) o macula densa cells (of JGA) detect changes in filtrate that they interpret as a decreased GFR o MD cells of JGA stimulate granular cells to release renin (not a hormone, it is an enzyme/ catalyst that raises blood pressure)  Renin is the first reaction in a chain reaction. It only catalyzes one thing o Turns Angiotensin (come from liver, constricts arteries) into Angiotensin I (doesn’t do much) o The enzyme Angiotensin Converting Enzyme from lungs converts Angiotensin I to Angiotensin II which is the active form which causes 5 things that raise BP Tubular Reabsorption  The kidneys filter the body’s entire plasma volume about 60 times / day (approx. every 22 minutes). o GFR = 120 mL/min = 7,200 mL/hour o In other words, your entire plasma volume would be filtered out of your kidneys in less than 30 minutes if not for reabsorption (transport of molecules from filtrate to blood).  Reabsorption may be active or passive.  65% of reabsorption takes place in the PCT  Use a sodium gradient for energy instead of glucose (like wheel in mill) (always less sodium in cytoplasm o Where sodium goes, water follows  Know #4 on chart o Aquaporins-Aqua channels  Allow water to be drawn back in  #2 and #3 pulls glucose and nutrients into blood (this is why should not be glucose in urine) o Keeps you from starving  Reabsorption Rates:  Any solutes that are actively reabsorbed require transport proteins in the membrane of the tubule cells. o the number of transporters for a particular solute indicates the importance of that solute to the body (i.e., high number of glucose and amino acid transporters vs. no urea transporters) o there is a transport max (Tm) determined by the number of transport proteins for a substance  hyperglycemia (glucose in urine because too much glucose in blood)➙ glycosuria

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Chapter 6.2, Problem 6E is Solved
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Textbook: Statistics for Engineers and Scientists
Edition: 4
Author: William Navidi
ISBN: 9780073401331

Since the solution to 6E from 6.2 chapter was answered, more than 340 students have viewed the full step-by-step answer. Statistics for Engineers and Scientists was written by and is associated to the ISBN: 9780073401331. This textbook survival guide was created for the textbook: Statistics for Engineers and Scientists , edition: 4. The full step-by-step solution to problem: 6E from chapter: 6.2 was answered by , our top Statistics solution expert on 06/28/17, 11:15AM. This full solution covers the following key subjects: George, Luis, work, got, correct. This expansive textbook survival guide covers 153 chapters, and 2440 solutions. The answer to “George performed a hypothesis test. Luis checked George's work by redoing the calculations. Both George and Luis agree that the result was statistically significant the 5% level, but they got different P-values. George got a P-value of 0.20 and Luis got a P-value of 0.02.a. Is is possible that George's work is correct? Explain.________________b. Is is possible that Luis's work is correct? Explain.” is broken down into a number of easy to follow steps, and 63 words.

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