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April 17, 2014

April 17, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**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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