Saturday
December 10, 2016

# Posts by tracy

Total # Posts: 808

statistics
Consider the following table and use the formulas that are given for computing the correlation coefficient. (Give your answer correct to two decimal places.) x 1 1 0 0 0 y 7 3 5 6 6 r = n xy − x y n x2 − x 2 n y2 − y 2 (1) r = SS(xy) SS(x) · SS(y) (2) ...
June 23, 2013

statistics
Consider the following set of data. (18, 12), (29, 48), (65, 29), (82, 24), (115, 56), (124, 13) (a) Calculate the covariance of the set of data. (Give your answer correct to two decimal places.) . (b) Calculate the standard deviation of the six x-values and the standard ...
June 23, 2013

statistics
this is what I done and it was wrong mean of x = 2.6 sd = 2.01108, y mean 3.9, sd 2.42441; then I added the sd 4.43549/(2.011080)(2.42441) = 5.3471 c. I just added all the x together = 26 sy = 39 The formula for 13.2 is r=covar(xto the 1power and y to 1power)= covar (x,y)/Sx X...
June 23, 2013

statistics
Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (b) Calculate the covariance. (Give your answer correct to two decimal places.) (c) Calculate sx and sy. (Give your answers correct to three decimal places.) sx = sy...
June 23, 2013

scientific notation am i doing it right?
8.34 times 10^4 in standard notation
May 25, 2013

log equation
2logt + 1/4[logt + 3logp]
May 16, 2013

accounting 206
cleveland metals uses a job cost and applies factory overhead to production at a predetermined rate of 180% of direct labor cost. data pertaining to recent operations follow
April 29, 2013

chemistery
you have 2.00kg of KCL dissolved in 0.600L of H2O what is the percent solution of KCL(w/v)?
April 24, 2013

english
what are some nongovernmential organization
April 17, 2013

algebra1
a baseball is hit into the air. the path of the ball can be described by the equation h=23t-5tsquared, where h is the height in meters, and t is the time in seconds. how high is the ball after 3 seconds?
April 11, 2013

accounting 205
compute the following items for lone pine company for 20x2, rounding all calculations to two decimal places when necessary
April 8, 2013

chemistry
the equilibrium constant for the synthesis of HBr(g0 from hydrogen and bromine gas is 2.18*10 exponent 6 at 730 degrees celcius.if 3.75 mol of HBr(g) is put into a 15L reaction vessel,calculate the concentration of H2,Br2 and HBr at equilibrium
April 2, 2013

acc. 205
partner investments, journal entries. The LP partnership was formed on January 1,19X7, by investments from bill levy and marv parcells. levy contributed $30,000 cash and 80,000 of land. Parcells contributed cash of$50,000 and equipment with a value of $20,000. prepare the ... March 29, 2013 math what is the value of 3^0+3^-2 March 7, 2013 STAT Calculate SP (the sum of products of deviations) for the following scores. Note: Both means are decimal values, so the computational formula works well. X Y 0 2 0 1 1 0 2 1 1 2 0 3 Assume a two-tailed test with  .05. (Note: The table does not list all the possible df... March 3, 2013 STAT An independent-measures research study compares three treatment conditions with a sample of n = 10 in each condition. The sample means are M1 = 2, M2 = 3, and M3 = 7 a. Compute SS for the set of 3 treatment means. (Use the three means as a set of n = 3 scores and compute SS.) ... February 24, 2013 Elmentary Math for Teachers II A spinner containing 8 numbers is spun. What is the probability of the event that the spinner A.) lands on an odd number? B.)lands on a number divisible by 3? C.)does not land on 5,6, or 7? D.)lands on a number less than 4? February 8, 2013 Elmentary Math for Teachers II From a set of eight marbles, five red and three white, we choose one at random. What are the odds in favor of choosing a red marble? February 8, 2013 Elmentary Math for Teachers II From a set of eight marbles, five red and three white, we choose one at random. What are the odds in favor of choosing a red marble? February 8, 2013 Elmentary Math for Teachers II In a class of seven students, a teacher spins a seven-sectored spinner (with equal-sized sectors) to determine which students to ask questions. Determine about how many times a student can expect to be called on when 100 questions are asked. February 8, 2013 stat Explain why using the t statistic may be an appropriate alternative to using a z-score February 5, 2013 Math I need help with this these two problem PLEASE!!! For a population with a mean of μ  80 and a standard deviation of   12, find the z-score corresponding to each of the following samples. a. M  83 for a sample of n  4 scores b. M  83 for a sample of... February 1, 2013 Math If the population standard deviation is   8, how large a sample is necessary to have a standard error that is: a. less than 4 points? b. less than 2 points? c. less than 1 point? February 1, 2013 chemistry 101 pls can anybody check my answers December 8, 2012 chemistry 101 If 15g of NaOh is dissolved in 285 g of water, calculate the following. Assume the density of the solution is 1.06 g/cc. a) Calculate the moles of NaOH in the solution? My answer is 15gNaOH/40g NaOH= .0375 mole NaOH b) Waht is the mass % w/w of the solution? My answer is 15g ... December 8, 2012 Math Help It takes Andy and Ben the same amount of time to eat 1 large piece of chocolate. It takes Charlotte 3 more mins than Andy and Ben to eat the same piece of chocolate. One day, Andy, Charlotte and Ben share 2 pieces of chocolate among them. It takes them 5 mins to eat 2 pieces ... December 2, 2012 Math It takes Andy and Ben the same amount of time to eat 1 large piece of chocolate. It takes Charlotte 3 more mins than Andy and Ben to eat the same piece of chocolate. One day, Andy, Charlotte and Ben share 2 pieces of chocolate among them. It takes them 5 mins to eat 2 pieces ... December 2, 2012 chem 1.Can a solution ever have a pH=0? 2.What does pH = 0 suggest about the concentration of the acid? 3.Can the pH ever be negative? 4.What is the significance of a negative pH in a solution? pls need help we didn't cover this in lecture yet. November 28, 2012 chem what would happen to the aacuracy and precision of measurements if the mass is measured to a tenth of a gram instead of a thousandth of a gram? November 26, 2012 chem thanks for the explanation pls is it endothermic or exothermic reaction i'm confused with this November 26, 2012 chem Zn^2+(aq) + 2OH^-(aq) ----> Zn(OH)2(s) a) how the addition of HCl affects the equilibrium? my answer is it will shift to the right b) how the addition of a small amount of NaOh affects the equilibrium?my answer is it will shift to the left c) how the addition of a large ... November 26, 2012 statistics.. URGENT!! PLZ!! The margin of error is: a. the difference between the point estimate and the true value of the population parameter b. the critical value times the standard error of the estimator c. the smallest possible sampling error d. none of the above Complete the following sentences ... November 24, 2012 chem How many grams of KBR, could be recovered by evaporating 650 g of a 15.0% KBr solution of dryness? November 21, 2012 chem When the concentration of I2 is increased to 1.5 M, the ratio of products to reactants is 28. The equilibrium constant for the reaction is 83. In which direction will the reaction shift to regain equilibrium? November 19, 2012 chem The molar concentrations for the reactants and products at equilibrium are found to be [HCl] = 0.80 M, [O2] = 0.20 M, [Cl2] = 3.0 M, and H2O = 3.0 M. What is the value of the equilibrium constant for this reaction? the complete reaction is 4HCl+O2=2Cl2+2H2O i got this answer ... November 19, 2012 chem a.) At equilibrium, the molar concentrations for reactants and products are found to be [I2] = 0.50 M,[Cl2] = 0.60 M, and [ICl] = 5.0 M. What is the equilibrium constant (Kc) for this reaction? b.) The concentration of I2 is increased to 1.5 M, disrupting equilibrium. ... November 19, 2012 chem An 80 proof brandy is 40.0% (v/v) ethyl alcohol. The "proof" is twice the percent concentration of alcohol in the beverage.How many milliliters of alcohol are present in 700mL of brandy? November 8, 2012 chem thanks DrBob222 i already figure out how to do it November 8, 2012 chem Calculate the final concentration of a. 4.0 L of a 4.0 M HNO3 solution is added to water so that the final volume is 8.0L b. Water is added to 0.35L of a 6.0M KOH solution to make 2.0L of a diluted KOH solution. c.A 20.0 mL sample of 8.0% (m/v)NaOH is diluted with water so ... November 8, 2012 algebra The price of a small cabin is$85000 the bank requires a 5% down payment the buyer is offered two mortgage options: 20 year fixed at 9.5% or 30 year fixed at 9.5% calculate the amount of interest paid for each option how much does the buyer save in interest with the 20 year ...
November 7, 2012

chemistry
Suppose you have 0.500 M sucrose stock solution. How do you prepare 250 mL of 0.348 M sucrose solution ?
November 7, 2012

math
Question: The price of a home is $180,000. The bank requires a 10% down payment. After the down payment, the balance is financed with a 30 year fixed mortgage at 6.3%. Determine the unpaid balance after ten years. Answer: The unpaid balance after ten years is$136,641.85 I ...
November 5, 2012

chemistry
a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
November 3, 2012

chem
a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
November 3, 2012

CHEM
what volume would 10.5g of nitrogen gas, N2, occupy at 200.K and 2.02atm?
November 2, 2012

chem
in a. I got 60 L for volume and .8 moles(.2+.6moles. now in b. i got .16 mole so where do I subtract .16 from should I subtract it from .8 moles or from the initial mole which is .2 mole
November 1, 2012

chem
A sample containing 6.40 g O2 gas has a volume of 15.0 L. Pressure and temperature remain constant. a. What is the new volume if 0.600 mole O2 gas is added? b. Oxygen is released until the volume is 12.0L. How many moles of O2 are removed? c. What is the volume after 7.50 g He...
November 1, 2012

chem
How are we able to determine that jupiter is mostly methane gas and that the surface of the sun is mostly He and H? can anyone help me pls
October 30, 2012

chem
How are we able to determine that jupiter is mostly methane gas and that the surface of the sun is mostly He and H? can anyone help me pls.
October 30, 2012

chem
if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O
October 19, 2012

math
A group medical practice has 40,000 patients. Charts vary in thickness from 1/4 to 1 inch thick. The average of all charts is 1/2 inch thick. Using the average 1/2 inch thickness, how many inches of shelf space will be required for 40,000 charts?
October 16, 2012

chemistry
if the mass of a metal is 127.70 grams, what is number of moles on the metal in the cube?
October 16, 2012

chemistry
How many water molecules are in the recommended volume of water (1.50L) that should be consume daily?
October 10, 2012

chemistry
what volume of water should be weighted out to represent one mole of water molecules at 20 degree C
October 10, 2012

chemistry
could donuts be quantified in terms of mass instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say...
October 10, 2012

chemistry
could donuts be quantified in terms of instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say you ...
October 10, 2012

chemistry
invent a term to describe a certain number of something you use that isn't already being used. Define and explain
October 9, 2012

chemistry
Assuming that the price of god is $11,000.00/Kg, What is the approximate$value of one mole of gold atoms?
October 9, 2012

chemistry
oh then good thanks a lot
October 5, 2012

chemistry
When will hydrogen bonding occur?Give an example of liquid other than H2O in which this type of force is important. In order for a hydrogen bond to occur there must be both a hydrogen donor and an acceptor present. The donor in a hydrogen bond is the atom to which the hydrogen...
October 5, 2012

chemistry
thank you
October 5, 2012

chem
so wrong post
October 5, 2012

chem
thanks now I understand way to go
October 5, 2012

chemistry
thanks a lot i was waiting for your comment
October 5, 2012

chemistry
Based on their boiling point, CH3CH2OH bpt. 78C, CH3CH2CH2OH bpt. 97C, CH3CH2CH2CH2OH bpt. 118 C how will I be able to rank these three in terms of strength of their IMF.Pls kindly explain it they gave this a a homework and never been discussed in class. thank you
October 5, 2012

chemistry
Rank C2H6O, C3H8O and C4H^10 O in terms of IMF and explain their structures? neeed heeelppp.thank you
October 5, 2012

physics
How high will a 1.85 kg rock go if thrown straight up by someone who expends 80.0 J of energy on it?
September 29, 2012

Science
How do you show a car constant speed Horizontal line or vertical
September 17, 2012

Physics
A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet's speed is 350 m/s, how far below the bull's eye does the bullet strike the target?
September 10, 2012

Physics
An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
September 10, 2012

Physics
An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
September 10, 2012

Physics
A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet speed is 350 m/s, how far below the bull's eye does the bullet strike the target?
September 10, 2012

basic statistics
What is construct a 95 percent confidence interval about the sample mean N= 11?
August 6, 2012

human growth and Development11
Samuel,a50-year-old psychologist, claims that he is a victim of"revolving door syndrome" What is Samuel's problem?
July 15, 2012

Physics
A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
June 29, 2012

Physics
A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
June 29, 2012

algebra
L= 2+2W perimeter = 2L+2W 28=2L + 2W 28=2(2+2W) + 2W 28=4+4W+2W 28=8W+2W 28=10W 28/10=W W=2.8
June 20, 2012

math
2(x-3)=(14-x)/5 10(x-3)=14-x 10x-30=14-x 11x-30=14 11x=44 x=4
June 20, 2012

Physics
wait nevermind i got it. i put in the wrong number. thanks :D
June 20, 2012

Physics
i did that for part a but i got 2.73 and the answer says its 2.87
June 20, 2012

Physics
A simple pendulum 1.50 m in length has a 500-g putty ball as an end bob. The pendulum is pulled aside 60° from the vertical and given an initial tangential speed of 1.20 m/s. At the bottom of the arc path, the bob hits and sticks to a 200-g putty ball sitting on a tee. (a...
June 20, 2012

accounting
kathy burnett works for trinity industries. Her pay rate is 12.84 per hour and receives overtime pay at one and one-half times her regular hourly rate for any hours worked beyond 40 in a week. During the pay period that ended December 31,2013, Kathy worked 48 hours. Kathy is ...
June 15, 2012

math
Find the distance to the horizon @ 32,000 feet.
May 16, 2012

MATH
An object is fired vertically upward with an initial speed of 68.6 meters per second. After t seconds, the height is shown by y = 4.9t^ + 68.6 t meters. Given that this object has an initial speed of 68.6 m/s, what is the maximum height it will reach?
April 26, 2012

biology
need help with a paper from news article on human biology using scientific method?
April 21, 2012

Pre-Algebra 2
write a rule for the linear function in the table x 1, 2,3,4, f(x) -7, -10,-13,-16
April 11, 2012

acids
Which of the following bases is the weakest? (CH3)2NH , Kb = 5.1 x 10–4 ClO–, Kb = 2.9 x 10–7 SO42–, Kb = 8.3 x 10–13
April 4, 2012

applied physics
Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions
April 1, 2012

math
simplify 15xy/35x
March 28, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 12, 2012

Physics
What is the magnitude of buoyant froce acting on a 720 cm^3 toy submarine foating in fresh water? (d water=1 g/cm^3)
March 12, 2012

Physics
A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?
March 12, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 12, 2012

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