For a sample group of 22, the mean is 86 with a standard deviation of 5. What is the 90% confidence interval of the true mean of the sample? Can you please explain the steps you used to get the answer. Thanks.
October 24, 2010
chemistry another add on
c)what is the pH after the addition of 1.0 mL of 0.10 M NaOH to 15 mL of the original solutiom.... i dont really need a im pretty sure my answer is right but should i really be getting the same answer for b and c?
October 13, 2010
a titration is done with with 25.00 mL of a .1500 M HBrO solution is titrated with .1025 M NaOH. Ka for HBrO= 2.0 x10^-9. The pH of HBrO before the titration begins is approx. closest to which of the following a. 0.82 b. 4.76 c. 8.70 d 10.60 e. 13.01 the answer is b 4.76 but how?
October 11, 2010
the Ksp for CaF2 is 3.9*10-11. assuming that calcium flouride dissociates completely upon dissolving and that there are no other important equilibria affecting the solubility, calculate the solubility in pure water, of calcium floride in m/L and in g/L
October 10, 2010
^ That is just an equation, it does not even answer the question.. I don't mean to be rude but even if you know the equation you can't answer the question if you do not know how to apply it.
September 27, 2010
In the movie "The Raiders of the Lost Arc", Indiana Jones and his guide play catch with a gold idol. The idol had a volume of about 1.30 L. In order to determine whether they could really play catch with the idol, calculate the weight (in pounds) of the idol. The ...
September 13, 2010
4.Tracie invested $x at 7% and $y at 6%. Write algebraic expressions for: a.the total amount of money invested b.the interest earned at 7% in one year c.the interest earned at 6% in one year d.the total interest earned in one year
July 28, 2010
1.)Explain why ironing boards always remain parallel to the floor and can be adjusted for people of various heights. You may want to consider the following: a.)The legs of the board are built so that AD = BD and DE = DF, and ADF and BDE are straight lines as shown. b.)Which ...
July 21, 2010
A cylindrical space colony 8 km in radius and 60 km long has been proposed as living quarters for future space explorers. Such a habitat would have cities, land and lakes on the inside surface and air and clouds in the center. All this would be held in place by the rotation of...
June 25, 2010
Is this code right? Declare Integer days, counter = 1 Declare Real penny = 1, salary, total = 0 Display "Enter a number of days." Input days Display "Days",TAB,"Salary While counter <= days Set salary = penny/100 Display counter, TAB, salary Set ...
May 21, 2010
What is the probability that a simple random sample of 56 special orders will provide an estimate of the population proportion of special orders specifying the color black that is within plus or minus .05 of the actual population proportion,assuming p = .36? In other words, ...
May 4, 2010
Replication of the E. coli chromosome takes 40 to 45 minutes, but the organism has a generation time of 26 minutes. How does the cell have time to make complete chromosomes for each daughter cell? For each granddaughter cell? my reponse was that the cells don't fully ...
March 29, 2010
This is one of the more helpful posts I found after finding this site on google, and it (like most others) is almost useless in its content related to the 1960's subculture.. and it is also filled with rude people telling its customers to search elsewhere.. I too will take...
March 11, 2010
actually if you state the documents out like that, you LOSE points and wont be able to go in the expanded core. just say "so and so stated this" and then in parentheses, say the document number. believe me ive been doing this without knowing, and my ap teacher just ...
March 6, 2010
URGENT help! 3. A rock sample was dated using potassium-40, Neasyrenebt ubducated tgat 1/8 of the original parent isotope is left in the rock sample. How old is the rock? 5. When a sample of lava solidfied, it contained 28g of uranium-238. It that lava sample was later found ...
March 5, 2010
Calculate the mass ( kg ) of the solute C4H8O and the volume ( mL ) of the solvent C6H6 that should be combined to generate 6450 g of a solution that is 2.07 m C4H8O. Density (kg/l) C4H8O 0.8892 C6H6 0.8786
February 1, 2010
So I have that 1.51 V - 1.065 V = .445 V = E and that ΔG = - 10 mol * 96485 J / mol*V * .445 V ΔG = -429358 J so then plugging in: K = e^(-(-429358)/(8.314 J/mol*K * 298 K)) K = 1.82 * 10^75 The 'correct' answer appears to be 1.5 * 10^75 , but that's not...
December 2, 2009
a store owner buys supplies from a vendor for $8,450. the terms of sale are 2/10, n/30. what will the net amount due be if the owner pays the bill by the 10th day after he receives the supplies?
November 23, 2009
Very close. Remember to change mm to meters. Greatly effects answer. Va/Vb = sqrt[(Tension1/Tension2)*(Diameter2^2/Diameter1^2)] Va/Vb = sqrt[(420/840)*((5.9E-4)^2/(1.3E-3)^2)]
November 20, 2009
you add the numbers together and divide by the how many numbers there are. Ex: 1+2+3+4+5=15 since there are five numbers (1,2,3,4,5) you divide by 5 15/5=3 3 is the average hope this helped!
November 9, 2009
Factors which effect reaction rates. 1) Concentration 2) Temperature 3) Presence of a Catalyst 4) Surface area 5) Orientation You store food in a fridge to prevent spoilage. Which factor are you applying to slow the rate of reaction? Which one of the following burns easily and...
September 21, 2009
1. The rationale for punishment and correction comes from A. the social contract theory. B. RawlsÃâÃâs theory. C. utilitarianism. D. egoism. 2. The two major justifications for treatment and punishment are A. ...
August 14, 2009
Fats offer a vast source of energy. (32kj as opposed to carbohydrates lowly 17kj for molecule) Fats can also be converted into adipose tissue which insulates and protects the body. Protein can be converted to glucose in deamination. And can also be used in growth replacement ...
June 27, 2009
Lipaze? Thats the enzyme used to break down protein. Well Penicillin prevents the synthesis of bacterial cell walls and other antibiotics punch holes in cell walls. Do you mean cell wall or cell membrane? Cell walls are found around plants and bacteria. ie. not human cells.
June 19, 2009
Ok the guy above is a retard and hasnt answered the question. Cell: Epithelial Cell (to be specific lets say a Glandular Epithelial Cell) Tissue: Epithelial Tissue Organ: Skin System: Immune system
June 5, 2009
Ray Cupple bought a basic car costing $10,150.00, with options costing $738.00. There is a 6% sales tax in his state and a combined $50.00 license and registration fee. What was Ray's total cost? A. $10,938.00 B. $11,541.28 C. $11,547.00 D. $11,591.28 which one is it c or...
June 4, 2009
Jane Marko buys a car for $11,400.00. In three years, the car depreciates 48% in value. How much is the car worth in three years? A. $3,800.00 B. $4,788.00 C. $5,472.00 D. $5,928.00 my work 11400.00*0.48=5472.00 am i right .
June 4, 2009
When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 1.0 M HCl is required to react completely with 4.00 g of magnesium i did 4.00g x (mol/24.31 g Mg) x (2 mol HCl/1 mol Mg) x (L/!.0 mol HCl) = .329 L why ...
March 26, 2009
Yeah I know...sorry, but that's all the information I was given Thank you for your answer. But what exactly do you mean by "then make to the final mark of the flask with water." ?
February 21, 2009
This is confusing. I am supposed to explain how to prepare a solution using the proper lab equipment (both from dry solid and a stock solution) Help would greatly be appreciated...
February 21, 2009
You find a male tribble with plaid fur. When you cross this male with a purebred solid blue female, all the offspring are solid blue. A cross between two of these F1 tribbles produces an F2 generation that is 3/4 solid blue and 1/4 plaid. All of the blue F2 tribbles are male. ...
February 16, 2009