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March 11, 2014

Search: Biostatistics

Number of results: 34

Biostatistics ??
Correlation is between what and what? What is your question?
Tuesday, May 22, 2012 at 12:09pm by PsyDAG

Biostatistics
if we select a birth at random, what is the probability the mother is 19 years of age or younger
Tuesday, March 23, 2010 at 3:14pm by Brenda

college biostatistics
if the mean bp is 110 and the standard deviation is 15 where would 95% of population be
Sunday, October 3, 2010 at 10:29am by donna

Biostatistics
Tukey HSD reports the results more accurately than using independent samples tests on the same data.
Monday, March 19, 2012 at 4:15pm by MathGuru

Biostatistics
What groups are you considering? What country? What areas of the country? What socioeconomic levels? More data needed.
Tuesday, March 23, 2010 at 3:14pm by PsyDAG

Biostatistics
Why are the results of an independent samples test different from the results of a Tukey HSD test on the same data?
Monday, March 19, 2012 at 4:15pm by Lindsey

Biostatistics
Suppose 2 rats die in the first 4hours. What is the probability that 2 or fewer rats will die in the next 4 hours.
Saturday, June 8, 2013 at 11:44am by Cathy

BIOSTATISTICS
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
Monday, April 1, 2013 at 12:54pm by PsyDAG

Biostatistics
I'm not sure what you mean by "P(X=x). If it is probability, add the probabilities for the two lower categories to indicate the probability that it is either (10-14) or (15-19). Does "Mid" refer to median? I hope this helps. If not, repost your question in clearer terms.
Sunday, March 28, 2010 at 9:25pm by PsyDAG

biostatistics
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores. For c, work backwards from the Z score for that proportion.
Friday, November 4, 2011 at 2:29pm by PsyDAG

Biostatistics
17. A research biologist has carried out an experiment on a random sample of 15 experimental plots in a field. Following the collection of data, a test of significance was conducted under appropriate null and alternative hypotheses and the P-value was determined to be ...
Wednesday, June 1, 2011 at 3:23pm by Anonymous

college math - biostatistics
a)(0.125) x (0.14) = ? b)(0.875) x (0.24) = c)(0.50)x(0.14) + (0.50)x(0.24) = ?
Wednesday, February 18, 2009 at 2:54am by drwls

Biostatistics
Age(10-14)(15-19)(20-29)(30-39) (40-44) Mid 12.5 17.5 25 35 42.5 P(X=x) .003 .100 .500 .300 .097 If we select a birth at random, what is the probability the mother is 19 years or younger?
Sunday, March 28, 2010 at 9:25pm by Louise

biostatistics
Seventeen people has been exposed to a particular disease. Each one independently has a 40% chance of contracting the disease. A hospital has the capacity to handle 10 cases of the disease. What is the probability that the hospital's capacity will be exceeded? a- .011 b- .736 ...
Wednesday, February 5, 2014 at 4:07pm by Ann

college biostatistics
Also you can find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion indicated. Insert Z score value in the formula below and solve for the score. Z = (score-mean)/SD = (score-110)/15 This method does not ...
Sunday, October 3, 2010 at 10:29am by PsyDAG

college biostatistics
http://davidmlane.com/hyperstat/z_table.html Try in the region of 135
Sunday, October 3, 2010 at 10:29am by bobpursley

Biostatistics
Test the potency of a drug on 20 rats. Previous animal show that a 10-mg dose of drug is lethal 5% of the time within 1st 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours. What is the probability that 3 or more rats will die in the first 4 hours.
Saturday, June 8, 2013 at 11:40am by Cathy

Biostatistics
Hi Bobpursley, Thank you very much for your answer... The problem is that I do not have any data on whether the boys got shots more frequently than girls enfants or whether boy babies whine more than girls... I guess those could be an explanation if I had more data... Would be...
Wednesday, January 16, 2013 at 7:50am by Marta

biostatistics
A studyis run to estimate the mean total cholesterol level in children 2 to 6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows: 185 225 240 196 175 180 194 147 223 Generate a 95% confidence interval for the true ...
Monday, November 7, 2011 at 10:00am by natasha

BIOSTATISTICS
Exercise : A machine is set up such that the average content of juice per bottle equals μ . A sample of 36 bottles yeilds an average content of 48.5cl. Test the hypothesis that the average content per bottle is 50cl at the significance level. Assume that the population ...
Monday, April 1, 2013 at 12:54pm by yao

biostatistics
95% confidence interval = mean ± 1.96 SEm SEm = SD/√n Find the mean first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard ...
Monday, November 7, 2011 at 10:00am by PsyDAG

biostatistics
Use the binomial probability function: P(x) = (nCx)(p^x)[q^(n-x)] n = 17 x = 11 through 17 p = 0.4 q = 1 - p = 0.6 Find P(11) through P(17). Add together for your probability. Note: You can also use a binomial probability function table with the values listed to find the ...
Wednesday, February 5, 2014 at 4:07pm by MathGuru

Biostatistics HW
Consider again the data in problem #6. Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. Exercise Group N Mean Std Dev ...
Tuesday, May 22, 2012 at 12:09pm by Anonymous

biostatistics
8. The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the difference in mean total cholesterol levels between treatments. New Drug (n=75) ...
Saturday, November 26, 2011 at 10:42am by natasha

Biostatistics
Your answer is nuts. Reason? I am wondering if you know what a confounding variable is? It is something that has a relationship to the independent variable, thus may be related to the dependent variable. Your answer, the amount of pain, is the dependent variable NIPS score. ...
Wednesday, January 16, 2013 at 7:50am by bobpursley

exercise: The average number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey 8 employees. The number of sick days they took for the past year are as follows: 12; 4; 15; 3; 11...
Monday, April 1, 2013 at 12:37pm by yao

biostatistics
Suppose we want to design a new placebo-controlled trial to evaluate an experimental medication to increase lung capacity. The primary outcome is peak expiratory flow rate, a continuous variable measured in liters per minute. the primary outcome will be measured after 6 months...
Saturday, November 19, 2011 at 6:58pm by Natasha

biostatistics
A clinical trial is run to assess the effects of different forms of regular exercise on HDL levels in persons between the ages of 18 and 29. Participants in the study are randomly assigned to one of three exercise groups - Weight training, Aerobic exercise or Stretching/Yoga...
Saturday, November 26, 2011 at 11:50am by natasha

biostatistics
among coffee drinkers, men drink a mean of 3.2 cups per day with a standard deviation of 0.8 cups. Assume the number of coffee drinks per day follows a normal distribution. a. What proportion drinks 2 cups per day or more? b. What proportion drink no more than 4 cups per day? ...
Friday, November 4, 2011 at 2:29pm by natasha

Find the mean first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = square root of variance Z = (mean1 - mean2)/...
Monday, April 1, 2013 at 12:37pm by PsyDAG

biostatistics
7. Consider again the data in problem #6. Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of a ...
Saturday, November 26, 2011 at 10:51am by natasha

college math - biostatistics
hey... first time user and really lost. wondering if someone can help: Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. However, about 24% of the people under 65 ...
Wednesday, February 18, 2009 at 2:54am by will

English
Everybody in my class got their paper work they have to do by the end of the week.I got mine too,so i would like you to help me with this :D? I got a paper with instructions: There are 8 students,each with different IQ.Those students recieved 10 medical books,(medical because ...
Tuesday, January 10, 2012 at 5:15am by Danijel

Biostatistics
Hi, I have answered some questions for some homework and I've got one of them wrong. I cannot modify my answer but I would really love to know why my answer is wrong. This is the statement of the problem: n this series of questions, we examine data from a study of 158 infants ...
Wednesday, January 16, 2013 at 7:50am by Marta

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