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September 21, 2014

# Posts by tracy

Total # Posts: 746

help with chem biochem
September 11, 2013

help with chem biochem
Ethanol + NAD+  acetaldehyde + NADH + H+  You have a 1 ml solution containing 100 uM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets converted to acetaldehyde.  a) What will the final concentration of ...
September 11, 2013

Math
A 120m cable TV tower casts a 96m shadow. Find the height of a nearby telephone pole that cast a 16m shadow.
August 27, 2013

Physics
An olympic sprinter can run 100yd in 9.0s. At the same rate, how long would it take the sprinter to run 100m?
July 9, 2013

Statistics
They all was wrong on (B).
June 29, 2013

Statistics
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = 2.6+.1x (b) Find the ordinates y hat for the points on the line of best fit ...
June 29, 2013

statistic check
Sorry but that answer is wrong also..
June 29, 2013

statistic check
Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 8, n2 = 10, and á = 0.025 F = 2.60 is what I got.
June 29, 2013

statistics
I think so
June 29, 2013

statistics
Sorry this is not right
June 29, 2013

statistics
I tried the F test calculator and that does not give me the answers that are needed. I have looked for one for critical region and have been unable to find one at this time.
June 29, 2013

statistics
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that ƒÏ = 0 in favor of ƒÏ ‚ 0 at...
June 29, 2013

math
Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 8, n2 = 10, and á = 0.025 F = 2.24 is what I got.
June 29, 2013

math
Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
June 29, 2013

math check
This will most likely be my last question that I have to post, I wanted to think everyone that has helped me and my friends when we had questions. This is a great site that helps when in need. Again Thank you all!!!!
June 28, 2013

math check
Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 8, n2 = 10, and á = 0.025 F = 2.6 .
June 28, 2013

math check
Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4, with n...
June 28, 2013

Math
So on B I got the answers, 0.5, 1.5, 2.5,3.5,4.5 And everything that I have tried on C is coming up wrong????
June 28, 2013

Math
I got the first part the answers were 2.6 and .1x, I can not figure out the rest of it B & C.
June 28, 2013

Math
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = 2.6,.1x Correct: Your answer is correct. . + Correct: Your answer is correct...
June 28, 2013

Math
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
June 28, 2013

Math
In a survey of families in which both parents work, one of the questions asked was, "Have you refused a job, promotion, or transfer because it would mean less time with your family?" A total of 200 men and 200 women were asked this question. "Yes" was the ...
June 28, 2013

Math
Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
June 27, 2013

Math
Sorry the r value..
June 27, 2013

Math
Population and crime rate?
June 27, 2013

Math
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that ƒÏ = 0 in favor of ƒÏ ‚ 0 at...
June 27, 2013

math
Sorry it keeps going together Samples are G & H N =386, 414 X =327, 321
June 27, 2013

math
Sample n x G 386 327 H 414 321
June 27, 2013

math
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 386 327 H 414 321 .
June 27, 2013

Math
Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal places.) Sample Number Mean Std. Dev. 1 25 38.6 13.7 2 29 42.1 10.2 .
June 27, 2013

Math
I came up with -114.80229
June 26, 2013

Math
Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal places.) Sample Number Mean Std. Dev. 1 25 38.6 13.7 2 29 42.1 10.2
June 26, 2013

Math
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 386 327 H 414 321
June 26, 2013

Statistics Help
Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (b) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
June 26, 2013

Statistic help
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
June 26, 2013

math
Thanks, but those are wrong also.
June 26, 2013

math
Those was not the right answers, the ones that I had got previous was also close to them.
June 26, 2013

math
Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.) Sample Number Mean ...
June 26, 2013

math check
Find the critical value for the hypothesis test, given the following. (Give your answer correct to two decimal places.) Ha: ó1 > ó2, with n1 = 8, n2 = 10, and á = 0.025 F = 2.24 is what I got .
June 26, 2013

Math check
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 386 327 H 414 321 2.71 was my answer. .
June 26, 2013

math help
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
June 26, 2013

Math question
How do you find the p-value, on a problem like below. The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, where d is the amount of corrosion on the coated portion ...
June 25, 2013

Statistics check
what do you mean with stat oldest L1, etc. Have a question I have a TI-83 Plus calculator, is there a way of putting in the information to get the p value or do you still have to look at a chart. When I read the instructions on it, it mentioned finding the z value to get to ...
June 25, 2013

statistics
Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
June 25, 2013

Statistics
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 386 327 H 414 321
June 25, 2013

math
But how do you get the p-value, I have worked it out by hand and also put into calculator and it comes up wrong. 0.0017 was the last answer I got. and 0.9991 before that. I have several questions like this asking for p-value so if you could work one out and I could use as an ...
June 25, 2013

statistics help
Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 188 174 192 196 65 Youngest 186 168 199 199 69 (a) Find t. (Give your answer correct ...
June 24, 2013

statistics
I have worked it out and found the t value as 3.80 and that came out right but the p value is not coming out right.
June 24, 2013

statistics check
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.) 5.35 was my answer . (c) Calculate sx and sy. (Give your answers correct to three ...
June 23, 2013

statistics
So this is what I came up with on (b) 6.93 and (c) 6.48 and those were wrong. I think I am missing them at the beginning when k-1=?-1 and n-k=?-?. Which graph or table are you getting these from? I figure out the other one to come up with the answers but I must of missed the ...
June 23, 2013

statistics
this is the answers that I got and they were wrong. f>equal to 3.20 for a part and b part I got f>equal to 3.41 But they both are wrong do not thing I am sitting them up right, any help?
June 23, 2013

statistics
Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4, with n...
June 23, 2013

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

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

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