Search: statistics/ Ho and Ha?

Number of results: 14,716

statistics
State the null and alternative hypothesis for the following: 1.) A small local bank wants to check if the average daily balance is not higer than 3500 for its individual saving account. Ho: Ha: 2.) A researcher wants to find out if the mean weekly wage of several thousands of ...
Sunday, September 30, 2012 at 11:09am by nitz

statistics t test
Yes, df = n-1 For two-tailed test: Ho: mean = X Ha: mean ≠ X For one-tailed test: Ho: mean < or = X Ha: mean > X or Ho: mean > or = X Ha: mean < X Ho = null hypothesis Ha = alternative hypothesis
Sunday, July 18, 2010 at 10:03pm by PsyDAG

statistics/ Ho and Ha?
For two-tailed test: Ho: μ = 15 Ha: μ ≠ 15 Since the sample value is greater than μ, for one-tailed test: Ho: μ = 15 Ha: μ > 15 I hope this helps. Thanks for asking.
Tuesday, March 11, 2008 at 11:00pm by PsyDAG

statistics/ Ho and Ha?
* I just wanted to know if I'm setting up the Ho and Ha correctly. An herbal supplement is advertised as producing an increase in strength and stamina. Sample of n=36 adults is obtained and each person is told to take the regulary daily dose of the herb for 30 days. At the...
Tuesday, March 11, 2008 at 11:00pm by Tina

Statistics
It would help if you proofread your questions before you posted them. Ho: mean = 10 Ha: mean < 10 ("equal to" is the Ho.) "Ho : u = 12.0 at a = 0.10"?
Saturday, November 19, 2011 at 1:28pm by PsyDAG

Statistics/Math- Please Help
For one-tailed test, you are only looking for deviation in one direction, indicated by your alternative hypothesis. Ho: a = b Ha: a > b or a < b For a two-tailed test, you are just looking for any difference. Ho: a = b Ha: a ≠ b I hope this helps.
Wednesday, November 17, 2010 at 4:06pm by PsyDAG

statistics
Ho: µ = ? Ha: µ does not equal ? µ < ? µ > ? Ho is the null hypothesis. Ha is the alternate hypothesis. The question mark is the value for you to fill in. One of the three is the correct one for the alternate hypothesis. Read the question ...
Tuesday, October 5, 2010 at 4:14pm by MathGuru

STATISTICS
A teacher wants to investigate whether there is a difference between male and female students in the amount of time they spend studying for statistics. What was the statistical test used to analyze the data? Is this a one or two tailed test? Identify Ha and Ho for this study. ...
Wednesday, February 15, 2012 at 6:31pm by caryn

statistics
It depends on what question you are asking. Ho: mean = 81% Ha: mean ≠ 81% Two-tailed Ho: mean = $3.00 Ha: mean > $3.00 I'm not sure what you mean by right-tailed or left-tailed. I don't use those specific terms.
Sunday, December 16, 2012 at 7:12pm by PsyDAG

math
Ho: µ = 243 Ha: µ < 243 I would definitely reject Ha. But since we have only two hypotheses, that would leave me to "fail to reject" Ho. However, I would rather accept Ha: µ > 243, but that was not an included hypothesis.
Saturday, March 16, 2013 at 12:15am by PsyDAG

Statistics
Ho: male mean = 70" Ha: male mean > 70" Ho: female mean = 66" Ha: female mean < 66" What are your sample values to test these hypotheses? Sample means, standard deviations and number of scores?
Monday, December 5, 2011 at 4:04pm by PsyDAG

statistics
Hypotheses: Ho: pY = pR (R = red trucks; Y = yellow trucks) Ha: pY < pR You can use a binomial proportion 2-sample z-test for this kind of problem. Here is one formula for this type of test: z = (pY - pR)/√(pq(1/n1 + 1/n2) p = (x1 + x2)/(n1 + n2) q = 1 - p pY...
Thursday, June 19, 2008 at 5:14am by MathGuru

stats
Ho: Mu = 150 Ha: Mu >150 some books set up Ho: as Mu is less than or equal to because the go in the opposite direction of the Ha. The Ho always includes the = You are testing to see if your mean is significantly different from the known 150. When you do the test you ...
Tuesday, March 12, 2013 at 1:49pm by Dr. Jane

stats
It depends on your book It can be set up as Ho: mu1 = mu 2 Ha: mu1 does not equal mu2 or other books write it as: Ho: mu1 - mu2 = 0 Ha: mu1 - mu2 does not = 0
Tuesday, March 12, 2013 at 3:40pm by Dr. Jane

statistics
Ho: mean = 12 Ha: mean ≠ 12 However, if box cannot hold more than 12 oz, then Ha: mean < 12
Saturday, April 7, 2012 at 9:20pm by PsyDAG

INTRO TO STATISTICS HYPOTHESIS TESTING
I would consider this a one-tailed test (state Ha as µ > 49600). When using a "does not equal" with Ha, you are just looking for a difference and the test would be two-tailed (either direction). Your test statistic calculation looks correct. This test ...
Friday, March 19, 2010 at 11:01pm by MathGuru

statistics
It depends on what your alternate hypothesis is. Ho: m1 = m2 Ha: m1 > m2 (one-tailed) or Ha: m1 ≠ m2 (two-tailed)
Wednesday, June 8, 2011 at 9:55pm by PsyDAG

statistics
Ho: no difference, method1 = method2 (null hypothesis) Ha: method1 ≠ method2 The above is if you would also want to know if the second method is worse (two-tailed). If you only want to consider it being better (one-tailed), then: Ha: method1 < method2
Wednesday, April 27, 2011 at 8:51pm by PsyDAG

maths
dh/dt = k/h^3 where k is unknown constant h^3 dh = k dt h^4/4 + c = kt at t = 0, h = ho ho^4/4 + c = 0 c = -ho^4/4 so h^4/4 -ho^4/4 = k t at t = T, h = 2 ho 16 ho^4/4 -ho^4/4 = k T 15 ho^4/4 = k T k = (1/T)(15 ho^4/4) so h^4 - ho^4 = 25 ho^4 (t/T) when is h = 3 ho ? 81 ho^4 - ...
Monday, February 1, 2010 at 1:46pm by Damon

Statistics
are the following statements, Ho:=10 and Ha:equal to or less than, a valid pair of null and alternative hypothesis?assume that in a hypothesis test with null hypothesis Ho : u = 12.0 at a = 0.10, that a value of 16.0 for the sample mean results in the null hypothesis being ...
Saturday, November 19, 2011 at 1:28pm by Cynthia

statistics/ Help!-thanks!
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people use the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population the mean # of cavities...
Saturday, August 25, 2012 at 4:28pm by StudentD

statistics
a the gym i notice women tend to work out together more then men. males together at gym 5 alone 7 women alone 6 together 6 what statistical test should i use what is the Ha and Ho what is the appropriate analysis and should the Ho be rejected
Monday, June 25, 2012 at 12:26pm by dave

Statistics Question
For a test of Ho: p = 0.5, the z test statistic equals 1.52. Find the p-value for Ha: p > 0.5.
Thursday, March 22, 2012 at 9:37pm by M

statistics
Ha: mean1 = mean2 Ho: mean1 ≠ mean2 (before sample measured) or Ho: mean1 > mean2 (after sample measured)
Thursday, April 11, 2013 at 10:25am by PsyDAG

statistics
c. If Ho: mean1 = mean2 and Ha: mean1 ≠ mean2, then use two-tailed test. If Ha: mean1 < mean2, use one-tailed test. We do not have access to Appendix A.
Sunday, June 12, 2011 at 8:17pm by PsyDAG

statistics
Ho: mean = 7.5 Ha: mean ≠ 7.5 P value is arbitrary, although most experimenters use P = .05 or .01. What test are you using?
Friday, July 22, 2011 at 2:46pm by PsyDAG

MS SUE I NEED HELP
THats not nice lolhi, wat u say is wat u r, so ha ha ha ha ha ha ha ha
Monday, June 8, 2009 at 10:15pm by ANGRYNESS

Statistics (incomplete)
Ho: mean > 500 Ha: mean ≤ 500 Data missing.
Friday, April 19, 2013 at 2:08am by PsyDAG

statistics
Below are examples for a one-sample test. For more than one sample, the hypotheses are set up a bit differently but the fundamentals are the same. Options for the null (one-sample): Ho: µ = ? -->meaning: population mean is equal to some value. Or... Ho: µ &...
Friday, June 4, 2010 at 3:30pm by MathGuru

statistics
if Ho:Mu=50 and Ha:mu 59 and beta=10 what is alpha if x exceeds 56 for n=49
Sunday, October 17, 2010 at 5:33pm by nee-nee

Statistics (oops)
Ho: x > 70,000 Ha: x ≤ 70,000
Wednesday, August 24, 2011 at 5:39pm by PsyDAG

4th grade fractions
u need more questions and answers thank u who ever!!!!ha ha ha ha ha ha ha and a million more!!!!!!!!!!!!!!
Wednesday, February 9, 2011 at 3:33pm by poop

Statistics
Ho: x ≥ 70,000 Ha: x < 70,000
Wednesday, August 24, 2011 at 5:39pm by PsyDAG

statistics
Ho: mean = 190 Ha: mean ≠ 190
Tuesday, March 6, 2012 at 10:16pm by PsyDAG

statistics
Ho: mean = 41 Ha: mean ≠ 41
Tuesday, December 6, 2011 at 2:58pm by PsyDAG

math
i posted this can you explain to me how to do this question i know i have to use differential equations but im not sure how to form an equation for inversely proportional question states grain is being poured at a steady rate to form a pile with height h, the rate at which the...
Tuesday, February 2, 2010 at 3:14am by lucy

statistics
From your data: Ho: mean 1 = mean 2 Ha: mean 1 ≠ mean 2 P = .05 Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√(n-1) Find table in the back of your statistics text labeled something ...
Sunday, September 19, 2010 at 11:41pm by PsyDAG

math please help
i posted this can you explain to me how to do this question i know i have to use differential equations but im not sure how to form an equation for inversely proportional question states grain is being poured at a steady rate to form a pile with height h, the rate at which the...
Tuesday, February 2, 2010 at 8:03am by lucy

statistics
Use the data given to test the following hupotheses. Assume the data are normally distributed in the population. Ho: M=7.48 Ha:m>7.48 xbar = 6.91, n=24, sigma=1.21,alpha=.01
Tuesday, April 19, 2011 at 11:57pm by daniel

Statistics
Since you are only concerned with finding if the sample mean is greater than the population mean, it is a one-tailed test. Ho: mean = 1000 Ha: mean > 1000
Saturday, November 19, 2011 at 8:23am by PsyDAG

hypothesis testing by mean levels
hi everyone... i have this homework.. i tried to solve it... can anyone check if it's right or not, please?? Question: The maximum acceptable level of a certain toxic chemical in vegetables has been set at 0.2 parts per million (ppm). A consumer health group measured the ...
Wednesday, November 10, 2010 at 4:22am by lubna

physics
fairly simple M=hi/ho also M=-di/do therefore M=hi/ho -di/do=hi/ho hi/ho=hi/ho
Wednesday, December 12, 2012 at 1:06pm by pking

statistics
Ho: Delivery time ≤ expectations Ha: Delivery time > expectations
Thursday, January 26, 2012 at 1:54am by PsyDAG

statistics
suppose you are testing Ho:p=.65 versus Ha: p<.65 . for a random sample of 100 people, x=58, where x denotes the number in the sample that have the characteristic of interest . use a .01 level of significance to test this hypothesis.
Wednesday, April 20, 2011 at 12:03am by daniel

statistics/ Help!-thanks!
I would phrase the hypotheses this way: Ho: µ ≥ 1.73 Ha: µ < 1.73 This would be a one-tailed test since Ha is showing a specific direction (less than). Use a z-test: z = (sample mean - population mean)/(standard deviation divided by the square root...
Saturday, August 25, 2012 at 4:28pm by MathGuru

Psychology
(a) and (c) Ho: u(ex) - u(ct) = 0 Ha:u(ex) – u(ct) is not equal to 0 Test stat: t = (38-35) / sqrt[9/20 + 25/30] = 2.6482 p-value = 2*P(t > 2.6482 with df = 48) = 0.0109 Conclusion: At the 5% significance level, reject Ho because the p-value is less than 5%
Thursday, September 23, 2010 at 8:32pm by Mrs. Nation

socials
oh thank you so much Mrs. Sue, you are the bset. could the others around him say poor guy ha ha ha, and or thats too bad ha ha ha, what do you think the others could say?
Monday, September 21, 2009 at 8:31pm by sara

Statistics
I'll give you a few hints to help get you started on this one. Ho: µ = 8 --->meaning: the population mean is equal to 8. Ha: µ > 8 --->meaning: the population mean is greater than 8. Using a one-sample z-test formula to find the test ...
Wednesday, April 8, 2009 at 11:47am by MathGuru

statistics
The researcher wanted to test the hypothesis that Ho: μ=3, knowing the population, which was normal, had a variance of 1.00. -- How powerful would this test be against the alternative hypothesis that Ha: μ=4, given that n=15, α = .05
Wednesday, June 4, 2008 at 9:01pm by Lezlie

statistics
so you look like mixed toast ha ha
Thursday, October 27, 2011 at 9:05pm by bob

maths
i follow you up to this point h^4 - ho^4 = 25 ho^4 (t/T) when is h = 3 ho ? 81 ho^4 - ho^4 = 25 ho^4 (t/T) 80 = 25 (t/T) t = 80T/25 = 16 T/5 where do you get 25 from and 81
Monday, February 1, 2010 at 1:46pm by lucy

sattistics
(a) and (c) Ho: u(ex) - u(ct) = 0 Ha:u(ex) – u(ct) is not equal to 0 Test stat: t = (38-35) / sqrt[9/20 + 25/30] = 2.6482 p-value = 2*P(t > 2.6482 with df = 48) = 0.0109 Conclusion: At the 5% significance level, reject Ho because the p-value is less than 5% I need ...
Saturday, July 18, 2009 at 11:57am by Mrs. Nation

statistics
Ho: Smoking during pregnancy is not related to premature birth. Ho: Exercise in older adults is not related to blood pressure levels.
Thursday, July 5, 2012 at 5:08pm by PsyDAG

statistics
We have no idea of the total wins for either team. Are you looking to find a significant correlation between wins and salaries? Ho: Wins have no relation to salaries ha: Wins are positively correlated to salaries
Friday, October 22, 2010 at 8:07pm by PsyDAG

statistics
Ho: mean1 = mean2 Ha: mean1 ≠ mean2 Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of ...
Sunday, April 29, 2012 at 11:57pm by PsyDAG

stats
I'll give a few hints and let you take it from there. Hypotheses: Ho: µ ≥ 26 Ha: µ < 26 Try a z-test to determine the test statistic. Formula: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size...
Wednesday, July 13, 2011 at 10:11am by MathGuru

Chemistry
I am going to assume that you did that correctly. and go from there. ***The problem I believe is that you didn't realize what ionic strength is equal to molarity. Let NaHPO4=A- and let NaH2PO4=HA 2.14=A-/HA and HA +A-=0.1 Solving for A-, A-=0.1-HA Substitute one equation ...
Tuesday, March 19, 2013 at 7:20pm by Devron

Chemistry Lab
HA + NaOH ==> NaA + H2O mols NaOH = M x L = ? mols HA = mols NaOH (look at the equation. 1 mol HA = 1 mol NaOH) M HA = mols HA/L HA. .........HA ==> H^+ + A^- I........?M......0......0 C.........-x.....x.......x E........?M -x...x.......x Ka = (H^+)(A^-)/(HA) ...
Tuesday, October 30, 2012 at 1:07pm by DrBob222

math
Ha Ha Ha Ha, you have to submit that today dont you???
Wednesday, July 18, 2012 at 10:34am by Costaatt Student

Hypothesis - Statistics
Null: Ho: µ = 18.4 -->population mean is equal to 18.4 Alternative: Ha: µ < 18.4 -->population mean is less than 18.4
Saturday, July 28, 2012 at 12:18pm by MathGuru

chem
When one 1 mole of A^- hydrolyzes, it produces 1 mole of HA and 1 mole of OH^-. Or you can make up an ICE chart from your equation. A^- + HOH ==> HA + OH^- initial: A^- = 0.1. HA = 0 OH = 0 change: HA = +x OH^- = +x A^- = -x equilibrium: HA = x OH^- = x A^- = 0.1-x etc...
Wednesday, May 13, 2009 at 10:07pm by DrBob222

statistics
This problem fits a multinomial experiment, not a goodness-of-fit test. The hypotheses would be something like the following: Ho: There was no preference shown (equally distributed). Ha: There was a preference shown (not equally distributed). You can check out the assumptions ...
Saturday, April 6, 2013 at 10:01pm by MathGuru

statistics
Your question is not clear. How are you going to determine IQ level of the 20 persons? Would this relate to your inquiry? Ho: mean = 100 Ha: mean > 100 If mean IQ = 100 and SD = 15 (as in WISC and WAIS): Z = (score-mean)/SEm SEm = SD/√n Find table in the back ...
Tuesday, February 14, 2012 at 9:37pm by PsyDAG

Psychological Statistics
Ho: Mean1 = mean2 Ha: Mean1 ≠ mean2 Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of ...
Monday, February 6, 2012 at 6:52pm by PsyDAG

psychology
Ho: change 1 = change 2 Ha: change 1 ≠ change 2 Z = (score-mean)/SD = (58-35)/10 = ? Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion in smaller area = Z score. The rest is up to ...
Monday, September 12, 2011 at 9:59am by PsyDAG

Statistics
To determine whether themean nicotine content of a brand of cigarettes is greater than the advertised value of 1.4 milligrams, a health advocacy program tests: Ho: mu = 1.4 Ha: mu > 1.4 The calculated value of the test statistic is z = 2.42. ==> How do I ...
Sunday, February 27, 2011 at 6:30pm by Emily

Statistics
What is the control situation? No teaching ? Another teaching method? Assume new teaching method = mean2. Ho: mean1 = mean2 Ha: mean1 < mean2
Thursday, March 22, 2012 at 9:14pm by PsyDAG

Chemistry
Let's just call this acid HA. It's the salt that is hydrolyzing, so A^- + HOH ==> HA + OH^- Kb = Kw/Ka = (HA)(OH^-)/(A^-) You know Kw, Ka is what you want, (HA)=(OH^-) and you can get the OH from the pH. After you find Ka, use that as you would a weak acid ...
Thursday, January 21, 2010 at 4:24pm by DrBob222

statistics
Try an independent groups t-test. This will be a two-tailed test because the problem is just asking if there is a difference, which could be in either direction. Ho: µ1 = µ2 -->population means are equal Ha: µ1 does not equal µ2 -->...
Wednesday, June 15, 2011 at 1:10pm by MathGuru

Chemistry
pH = pKa + log{[A-]/[HA]} or pH = pKa + log{[NaA]/[HA]} if pH = pKa, then {[log{[NaA]/[HA]} = 0 or [NaA] = [HA] The reaction between NaOH and HA is: NaOH + HA --> NaA + H2O Since we start with no NaA, we must add enough NaOH so that [NaA] = [HA] That happens when we ...
Monday, January 12, 2009 at 5:33pm by GK

math statistics
a. Ho: Shift length is not related to medication errors or Ho: Medication errors in standard/normal shifts = medication errors in extended shifts b. Ho: New drug effects = current drug effects
Thursday, July 5, 2012 at 4:56pm by PsyDAG

proabilities
HO HO HO, a random drawing involved in $$$ choices. Pr=1/18*1/17
Thursday, March 3, 2011 at 8:27pm by bobpursley

physics
error: fairly simple M=hi/ho also M=-di/do therefore M=hi/ho -di/do=hi/ho hi/ho=-di/do
Wednesday, December 12, 2012 at 1:06pm by pking

Statistics
I have a question that involves explaining what is wrong in each of the following situations: (a) A random sample of size 20 is taken from a population that is assumed to have a standard deviation of 12. The standard deviation of the sample mean is 12/20. (b) A researcher ...
Sunday, March 29, 2009 at 11:13pm by Lynn

grenoble
Do you want the fraction [A-]/[HA] dissociated? [Your value for the pKa for aspirin is low from memory =about 3.5??] From the H-H equation pH=pKa+log([A-]/[HA]) 8.6=5.6 + log([A-]/[HA]) 3.0=log([A-]/[HA]) so 10^+3 = [A-]/[HA]
Monday, June 20, 2011 at 10:30am by Dr Russ

Chemistry
These don't hold up for valences but A = reactants = HO + CH3N B = the intermediate = HO-CH2N C = product = HO-CH3 + N
Sunday, June 17, 2012 at 1:01pm by DrBob222

Statistics
An agricultural field trial compares the yield of two varieties of tomatoes for commercial use. The researchers divide in half each of 10 small plots of land in different locations and plant each tomato variety on one half of each plot. After harvest, they compare the yields ...
Wednesday, August 1, 2007 at 4:47pm by Kasey

Chem
No. H^+ is not equal to A^. HA ==> H^+ + A^- Ka = 3.2 x 10^-4 = (H^+)(A^-)/(HA) The problem tells us that the pH of the stomach is about 1.5 so that is the H^+. 1.5 = -log(H^+) and (H^+) = 0.0316 M. Then (H^+)(A^-)/(HA) = 3.2 x 10^-4 0.0316(A^-)/(HA) = 3.2 x 10^-4 (A...
Sunday, July 26, 2009 at 9:51pm by DrBob222

statistics
Try a two-sample test. Hypothesis: Ho: µ1 = µ2 Ha: µ1 does not equal µ2 This is a two-tailed test because the problem is just asking if there is a difference (no specific direction in the alternate hypothesis). P-value is the actual level of the test ...
Thursday, March 15, 2012 at 8:44pm by MathGuru

Statistics
Try an independent groups t-test. This will be a two-tailed test because the problem is asking if there is a difference, which could be in either direction. Hypotheses: Ho: µ1 = µ2 (1 = females; 2 = males) Ha: µ1 ≠ µ2 Compare the test ...
Wednesday, November 7, 2012 at 3:23am by MathGuru

Physics
How long did it take to hit the water? time= 2.16/3.14 seconds hf=ho- 1/2 g t^2 0=ho-4.9 t^2 solve for ho,knowing t
Tuesday, February 16, 2010 at 3:03pm by bobpursley

Chem
No. Think of acetic acid which you have done many times. If we call acetic acid, HA, (and we fan call aspirin HA), then HA <==> H^+ + A^- We know that for every molecule of HA that ionizes, 1 H^+ and `1 A^- are produced but that says nothing about HA and H^+ or ...
Sunday, July 26, 2009 at 9:51pm by DrBob222

STATS
If Ho: μ = 50 and Ha: mu. = 59 and s = 10 what is αlpha if x exceeds 56for n=25
Friday, March 15, 2013 at 10:42am by KP

math please help
81 = 3^4 The "25" comes from previous step, canceling out ho^4. 81 ho^4 - ho^4 = 25 ho^4 (t/T) 80 = 25 (t/T)
Tuesday, February 2, 2010 at 8:03am by drwls

immediate help needed statistics one tailed hypo
Ho: µ = $424 --->null hypothesis Ha: µ > $424 --->alternative hypothesis Since the alternative is showing a specific direction, the test is one-tailed.
Monday, July 19, 2010 at 5:36pm by MathGuru

Hypothesis Statistics
Ho: µ = 18.4 -->population mean is equal to 18.4 Ha: µ < 18.4 -->population mean is less than 18.4 This would be a one-tailed test because the alternative hypothesis is showing a specific direction. Note: The null hypothesis always uses an ...
Sunday, September 9, 2012 at 12:26am by MathGuru

STATISTICS
"Was" implies that the test has already been designated. What was it? Where is the data? However, I can tell you that: Ho: female time mean = male time mean Ha: female time mean ≠ male time mean With those hypotheses, it would be a two-tailed test.
Wednesday, February 15, 2012 at 6:31pm by PsyDAG

statistics
a. What methods were in the section? Probabilities can be calculated for a normal distribution. b. Ho: mean 1 = mean 2 Ha: mean 1 ≠ mean 2 c. Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/&...
Friday, October 7, 2011 at 9:18am by PsyDAG

statistics
Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√(n-1)(but you can use n) If only one SD is provided, you can use just that to determine SEdiff. You can do the calculations in thousands, leaving...
Monday, May 16, 2011 at 7:50am by PsyDAG

statistics
Suppose you want to test the claim that mu is not equal to 3.5. Given a sample size of n = 31 and a level of significance of alpha = 0.10 when should you reject Ho? A) Reject Ho if the standardized test statistic is greater than 2.575 or less than -2.575. B) Reject Ho if the ...
Tuesday, June 21, 2011 at 9:05pm by Brittany

earth science
Ho HO HO!
Monday, January 3, 2011 at 5:06pm by cool kid

chemistry
Let's call aspirin, HA HA ==> H^+ + A^- Ka = (H^+)(A^-)/(HA) (H^+) = x (A^-) = x (HA) = 500 mg x 2 tablets = 1000 mg (1 gram and moles is 1g/molar mass with M = mols/0.325L. Solve for x and convert to pH.
Sunday, December 5, 2010 at 8:53pm by DrBob222

Statistics
Ho: μ=$250 Ha: μ>$250 Calculate a Z-score. Z = (x-μ)/SD Z = ($275.66 - $250)/$78.11 Since you are only interested in finding if the amount exceeds the expected mean, you have a one-tailed test. In a table in the back of your statistics text ...
Sunday, June 8, 2008 at 7:41pm by PsyDAG

Statistics
Assume a normal distribution. Ho: mean = 219 mg/100 ml Ha: mean ≠ 219 mg/100 ml c. Z > ± 1.645 Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√(n-1) If only one SD is ...
Monday, December 6, 2010 at 1:28am by PsyDAG

Physics
the height of a freely falling object is: H = .5g*t^2 + Vo*t + Ho Vo is the initial vertical velocity Ho is the initial height (height of building) the height is 0 when the brick hits the ground in 3.3 sec g is -9.8 m/s^2 H = .5gt^2 + [17 * sin(25º)]t + Ho 0 = -4.9(3.3^2...
Wednesday, September 12, 2012 at 3:46pm by Scott

Statistics
We do not do your work for you. Once you have answered your questions, we will be happy to give you feedback on your work. Although it might require more time and effort, you will learn more if you do your own work. Isn't that why you go to school? However, I will start ...
Saturday, August 7, 2010 at 9:46pm by PsyDAG

chemistry
For simplicity, let's call cloroacetic acid HA. Then HA ==> H^+ + A^- Ka = (H^+)(A^-)/(HA) Convert pH to (H^+) from pH = -log(H^+). (A^-) is the same. After equilibrium is attained, (HA) - 0.112-(H^+). Solve for Ka.
Tuesday, June 15, 2010 at 12:28pm by DrBob222

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