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April 17, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics (?)
What is your question? There is no data.
Saturday, August 17, 2013 at 12:40pm

Statistics
Problem 1 The null hypothesis is: The proportion of plants in Category A is expected to be 9/16; the difference in the sample is due to chance. Problem 2 The alternative hypothesis is: The model is good. Problem 4 The chi-square statistic is closest to 2.5 Problem 5 Degrees of...
Saturday, August 17, 2013 at 12:40pm

Statistics
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
Saturday, August 17, 2013 at 12:39pm

Statistics
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
Saturday, August 17, 2013 at 12:39pm

Statistics
A simple random sample of cars in a city was categorized according to fuel type and place of manufacture. domestic foreign gasoline 146 191 diesel 18 26 hybrid 51 79 Are place of manufacture and fuel type independent? If the two variables were independent, the chance that a ...
Saturday, August 17, 2013 at 9:19am

Statistics
According to a genetics model, plants of a particular species occur in the categories A, B, C, and D, in the ratio 9:3:3:1. The categories of different plants are mutually independent. At a lab that grows these plants, 218 are in Category A, 69 in Category B, 84 in Category C...
Saturday, August 17, 2013 at 8:39am

statistics
A group of scientists is studying whether a new medical treatment has an adverse (bad) effect on lung function. Here are data on a simple random sample of 10 patients taken from a large population of patients in the study. Both variables are measurements, in liters, of the ...
Saturday, August 17, 2013 at 2:45am

Statistics
C) The z statistic is closest to 0.8 1.0 1.2 1.4 1.6 1.8 2.0 D) The conclusion of the test is (pick the better of the two options) The observed difference is due to chance. The treatment has an effect.
Friday, August 16, 2013 at 8:30pm

STATISTICS
Is it C?
Friday, August 16, 2013 at 2:00pm

statistics
Z = (score-mean)/SD
Friday, August 16, 2013 at 12:53pm

STATISTICS
Should be C
Friday, August 16, 2013 at 8:30am

Statistics
Hi Fábio How do you calculate the P8?
Friday, August 16, 2013 at 7:40am

Statistics
P8= 15%-20% P3=1.2
Friday, August 16, 2013 at 6:54am

Statistics
In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
Friday, August 16, 2013 at 3:09am

STATISTICS
A is correct
Friday, August 16, 2013 at 1:43am

STATISTICS
a is not right either
Friday, August 16, 2013 at 1:43am

STATISTICS
B is not correct
Friday, August 16, 2013 at 1:35am

statistics
RR=1.89; OR=2.05
Friday, August 16, 2013 at 1:32am

Statistics
sorry Walter i don't understand what is: 6f02271d.linkbucks ?
Thursday, August 15, 2013 at 5:23pm

STATISTICS
plz help
Thursday, August 15, 2013 at 5:06pm

Statistics
in the last post is the link of the answers you need to complete with dotcom in the browser. you are welcome ;)
Thursday, August 15, 2013 at 5:05pm

Statistics
Exercise set 4 answers: 6f02271d.linkbucks
Thursday, August 15, 2013 at 5:04pm

STATISTICS
What is the Answer? Is it B?
Thursday, August 15, 2013 at 3:32pm

STATISTICS
Try B and let me know.
Thursday, August 15, 2013 at 3:29pm

STATISTICS
D. 0.05 is incorrect
Thursday, August 15, 2013 at 3:24pm

STATISTICS
What was the correct answer?
Thursday, August 15, 2013 at 3:01pm

statistics
Suppose test scores follow a normal distribution with ì= 80 and ó = 5. Calculate the z-score for a score of 90.
Thursday, August 15, 2013 at 2:59pm

STATISTICS
no right (e)
Thursday, August 15, 2013 at 2:43pm

Statistics
i have this answer right just by lucky i don't now how solve this... i really want to understand how calculate P8
Thursday, August 15, 2013 at 1:44pm

Statistics
Really stuck with P: A group of scientists is studying whether a new medical treatment has an adverse (bad) effect on lung function. Here are data on a simple random sample of 10 patients taken from a large population of patients in the study. Both variables are measurements, ...
Thursday, August 15, 2013 at 1:34pm

STATISTICS
I think it's D or A Is that right?
Thursday, August 15, 2013 at 1:21pm

Statistics
P1 - The treatment has no effect. P2 - 4.5 P3 - 1.2 P4 - The observed difference is due to chance.
Thursday, August 15, 2013 at 1:15pm

Statistics
If not E, I would pick C for the same reason.
Thursday, August 15, 2013 at 12:44pm

Statistics
Use the following figure to answer questions 12-14: Figure 3b (British J Derm 2008) comes from a randomized trial of DHA versus a placebo pill for treating eczema. The figure shows boxplots of the eczema severity score, SCORAD, at baseline and week 8 for each group. SCORAD ...
Thursday, August 15, 2013 at 12:13pm

Statistics
Use the following table to answer questions 7 and 8: This table displays results from a prospective cohort study evaluating meat intake and mortality. The table displays hazard ratios for mortality by quintile of red meat intake. Table 2. Multivariate Analysis for Red, White, ...
Thursday, August 15, 2013 at 11:58am

Statistics
P3 steps: 1º- read the problem 2º- what are the 162 and 97? you need to do something to these numbers so you can make the calculations 3º- calculate the difference 4º- calculate the SE to the difference 5º- apply the formula of z-test to the difference...
Thursday, August 15, 2013 at 9:24am

Statistics
WARNING! Answer 6, given by Joanne is wrong!! If you don´t want to help, don´t, but don´t hurt!!
Thursday, August 15, 2013 at 8:51am

Statistics
Ok. So I got 1.69 and chose 1.6 and got it wrong.
Thursday, August 15, 2013 at 8:47am

Statistics
Can anyone show the calculation for P8?
Thursday, August 15, 2013 at 7:46am

Statistics
P3 If you have the answer for P2 right it is easy to calculate the Z-test look too week 3 you have a lot of examples.
Thursday, August 15, 2013 at 6:43am

Statistics
WARNING! Problem 4 Answer Given by Denise is wrong! What is the result for problem 3?
Thursday, August 15, 2013 at 6:27am

Statistics
Hey be careful some are given the wrong answer... Please try understand the exercises...
Thursday, August 15, 2013 at 5:40am

statistics
please tell me wat is SE, i Am not getting the right answer
Thursday, August 15, 2013 at 2:24am

Statistics
if you visit http://davidmlane.com/hyperstat/z_table.​html I think you will find it easy to answer all these questions, and if you play around some you should see how it all fits together.
Wednesday, August 14, 2013 at 8:35pm

Statistics
thx u very much denise
Wednesday, August 14, 2013 at 8:23pm

Statistics
PROBLEM 4 the right answer is The treatment has an effect
Wednesday, August 14, 2013 at 8:20pm

Statistics
thanks joan
Wednesday, August 14, 2013 at 8:18pm

Statistics
PROBLEM 6 answer is The result is not statistically significant, so we conclude that the sons are taller than their fathers, on average.
Wednesday, August 14, 2013 at 8:18pm

Statistics
PROBLEM 9 The conclusion of the test is The treatment had a bad effect. is the right answer
Wednesday, August 14, 2013 at 8:15pm

Statistics
Based on the information given, which test should you perform? binomial test for the fairness of a coin is the right answer
Wednesday, August 14, 2013 at 8:13pm

Statistics
Based on the information given, which test should you perform? binomial test for the fairness of a coin is the right answer
Wednesday, August 14, 2013 at 8:13pm

Statistics
Based on the information given, which test should you perform? binomial test for the fairness of a coin is the right answer
Wednesday, August 14, 2013 at 8:12pm

STATISTICS
What's right?
Wednesday, August 14, 2013 at 7:08pm

STATISTICS
What is the answer to this?
Wednesday, August 14, 2013 at 6:51pm

Statistics
Problem 2 the answer is 4.5% You now the correct answer for the problem 7?
Wednesday, August 14, 2013 at 5:21pm

Statistics
E is not the correct answer.
Wednesday, August 14, 2013 at 2:37pm

Statistics
A student is taking a true/false exam with 15 questions. If he guesses on each question, what is the probability he will get at least 13 question right?
Wednesday, August 14, 2013 at 1:30pm

Statistics
Given that a population of scores is normally distriibuted with u=100 and o=8, determine the following: a. The percentile rank of a score of 120 b. The perentage of scores that are below a score of 99 c. The percentage of scores that are between a score of 101 and 122 d. The ...
Wednesday, August 14, 2013 at 1:26pm

STATISTICS
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.
Wednesday, August 14, 2013 at 11:51am

Statistics
I would pick E. Out of 100 factors, P = .03 is the probability that 3 would have statistical significance.
Wednesday, August 14, 2013 at 11:49am

Statistics
Please help! I know that E is incorrect. Researchers conducted a case-control study to identify risk factors for kidney cancer. They asked 50 cases and 50 controls about 100 different exposures and personal characteristics, and calculated the odds ratio for kidney cancer for ...
Wednesday, August 14, 2013 at 9:36am

Statistics
PROBLEM 3 The z statistic is closest to 0.8 1.0 1.2 1.4 1.6 1.8 2.0 PROBLEM 4 The conclusion of the test is (pick the better of the two options) The observed difference is due to chance. The treatment has an effect
Wednesday, August 14, 2013 at 2:01am

STATISTICS
what is the correct answer?
Tuesday, August 13, 2013 at 8:51pm

STATISTICS
Researchers conducted a case-control study to identify risk factors for kidney cancer. They asked 50 cases and 50 controls about 100 different exposures and personal characteristics, and calculated the odds ratio for kidney cancer for each risk factor. They found statistically...
Tuesday, August 13, 2013 at 8:50pm

STATISTICS
Wrong and quit cheating on your stats exam
Tuesday, August 13, 2013 at 5:12pm

statistics
Researchers reported that in a sample of U.S. women aged 50 to 54 who underwent mammography, 14.4% were recalled for further evaluation; however, in a similar sample of women undergoing mammography in the United Kingdom, only 7.6% were recalled for further evaluation. What are...
Tuesday, August 13, 2013 at 2:41pm

statistics (?)
Have you followed the "steps in Problems 1 through 4"?
Tuesday, August 13, 2013 at 2:31pm

Statistics
Biased. First of all, are you dealing with bachelors, masters or doctorate levels? Second, they probably do not represent the total population of degree graduates, but only those in your institution, which may or may not be a good representation of the population.
Tuesday, August 13, 2013 at 2:28pm

STATISTICS
0.05
Tuesday, August 13, 2013 at 12:21pm

Statistics
Suppose you want to figure out what to do with your degree in psychology. You ask some fellow students from your psychology program who recently graduated to find out what they are doing with their degree and how much it pays. What type of sampling is this? What are the ...
Tuesday, August 13, 2013 at 4:27am

statistics
In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
Monday, August 12, 2013 at 11:40pm

statistics
In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. When the patients were assessed at the end of the study, favorable outcomes ...
Monday, August 12, 2013 at 11:40pm

Statistics
Using a formula for confidence interval of variance with your data included, we have: [(6-1)16.8]/(chi-square) to [(6-1)16.8]/(chi-square) Use values from a chi-square table that equate to a 99% interval using 5 degrees of freedom, then finish the calculation for the interval.
Monday, August 12, 2013 at 6:16pm

statistics
0.57
Monday, August 12, 2013 at 1:14pm

Statistics
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z score.
Monday, August 12, 2013 at 12:47pm

statistics
Being P so small, it must be the other answer?? right???
Monday, August 12, 2013 at 11:12am

statistics
Building on above answer from PsyDAG, when you run the calculation for Z and check the normal distribution table, you get get a p value of 0.22%, which is highly statistically significant, so we conclude that sons are taller, on average, than their dads.
Monday, August 12, 2013 at 10:12am

Statistics
Bob takes an online IQ test adn finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the poulation would score higher than Bob? Lower than Bob?
Sunday, August 11, 2013 at 11:32pm

Math/Statistics
z-score for 90 = (90-82)/8 = 1 so don't even have to go to tables or charts, we are 1 standard deviation from 82, so a score of 90 will do it
Sunday, August 11, 2013 at 8:56pm

Math/Statistics
A statistics teacher believes that the final exam grade for her elementary stats class have a normal distribution with a mean of 82 and a standard deviation on 8. Find the score which separates the top 10% of the scores from the lowest 90% of the scores.
Sunday, August 11, 2013 at 8:51pm

STATISTICS
0.05
Sunday, August 11, 2013 at 5:47pm

statistics
Right.
Sunday, August 11, 2013 at 12:13pm

statistics
0.13
Sunday, August 11, 2013 at 11:58am

statistics
0.5
Sunday, August 11, 2013 at 5:00am

statistics
1. I took a sample of the grade point averages for students in my class. For 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was:
Sunday, August 11, 2013 at 2:58am

Statistcs
a. Best point estimate from your data is your sample mean. b. 95% = mean ± 1.96 SEm SEm = SD/√n c. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/...
Sunday, August 11, 2013 at 12:30am

statistics
Z = (mean1 - mean2)/standard error (SE) of difference between means Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. Are you using two-tailed test or one...
Sunday, August 11, 2013 at 12:22am

STATISTICS
why b? ref is not ex-
Saturday, August 10, 2013 at 7:13pm

STATISTICS
A study examining the relationship between fetal X-ray exposure and a particular type of childhood blood cancer found the following odds ratio (and 95% confidence interval) for the association: 2.44 (0.95 to 6.33). This result would likely be considered: a. clinically ...
Saturday, August 10, 2013 at 7:12pm

STATISTICS
You are performing a cohort study to look at risk factors for breast cancer in postmenopausal women. If the probability of developing breast cancer among smokers is .05 for the study duration, then if you sample 100 smokers, how many do you expect to develop the disease? Give ...
Saturday, August 10, 2013 at 7:10pm

STATISTICS
In a psychology experiment in which 100 volunteers were asked to read a paragraph about an engineer, 65 assumed that the engineer was male despite the fact that the paragraph did not specify gender (and avoided gendered pronouns such as “he” or “she”). If ...
Saturday, August 10, 2013 at 7:07pm

STATISTICS
52%-58%
Saturday, August 10, 2013 at 6:30pm

STATISTICS
0.021
Saturday, August 10, 2013 at 6:29pm

STATISTICS
B) Age is a confounder of the relationship between gender and heart disease.
Saturday, August 10, 2013 at 6:24pm

STATISTICS
It cannot be determined from the information given
Saturday, August 10, 2013 at 6:14pm

STATISTICS
RR= 1.89 OR= 2.05
Saturday, August 10, 2013 at 6:13pm

STATISTICS
Increasing the variability of the outcome.
Saturday, August 10, 2013 at 6:00pm

STATISTICS
Is a measure of the variability of a sample statistic.
Saturday, August 10, 2013 at 5:57pm

STATISTICS
increasing the variability
Saturday, August 10, 2013 at 5:55pm

STATISTICS
susie, is b correct?
Saturday, August 10, 2013 at 5:44pm

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