How's the economy? A polister wants to construct a 95% confidence interval for the proportion of adults who believe thateconomic conditions are getting better.Part: 0/2Part 1 of 2(a) A poll taken in July 2010 estimates this proportion to be 0.33. Using this estimate, what sample size is needed so thatthe confidence Interval will have a margin of error of 0.03?A sample ofadults is needed to obtain a 95% confidence interval with a margin of errorof 0.03.

Answered: Image /qna-images/answer/4941ac9d-e112-4685-8491-f473a4af04ff.jpg

Answered: How's the economy? A pollster wants to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Researchers studying the spread of an insect called the hemlock woolly adelgid find that the bugs have infested 23% of a random sample of 345 hemlock trees in the study area. What's a 99% confidence interval for the population proportion of infested hemlock trees in the study area?
Results from the National Health and Nutrition Examination Survey (NHANES) conducted thirty years ago revealed that out of 378 randomly selected adults in the United States 57 were considered to be obese. In this year’s National Health and Nutrition Examination Survey, out of 426randomly selected adults in the United States 135 were considered to be obese. Use the results of the National Health and Nutrition Examination Survey and a 99% confidence interval to estimate the difference between the percentages of adults in the United States that are obese this year and thirty years ago. Express the estimate both symbolically and verbally.
What is the t value with a 90% confidence interval for the true population mean if the sample size n = 21? (Please keep three decimal places)
A multiple-comparison procedure for comparing four treatment means produced the confidence intervals shown to the right. Rank the means from smallest to largest. Which means are significantly different? (H1 - H2): (4,17) (H1 - H3): (5,8) (H1 - H4): (- 12,2) (H2 - H3):(-4,11) (H2 - H4):(-13, - 5) (H3 - H4):(-8, - 3) Rank the means from smallest to largest. Select the correct answer below. O A. (H1 H4) < (H2.H3) Oc. (41.42) < (H3-H4) O E. (H2.H3) (H1.H4) O B. (H3-H4) < (H1 2) O D. (41.43) < (42-H4) OF. (42:4) < (41.H3) Which means are significantly different? Select all that apply. O A. H, and P4 O B. H, and µ2 O C. H, and H3 O D. H, and H4 O E. Ha and H4 O F. H, and H3
Rock band The Rolling Stones have played scores of concerts in the last twenty years. For 30 randomly selected Rolling Stones concerts, the mean gross earnings is 2.18 million dollars. Part a) Assuming a population standard deviation gross earnings of 0.53 million dollars, obtain a 99% confidence interval for the mean gross earnings of all Rolling Stones concerts (in millions).Confidence interval: ( , ). Part b)Which of the following is the correct interpretation for your answer in part (a)?A. If we repeat the study many times, 99% of the calculated confidence intervals will contain the mean gross earning of all Rolling Stones concerts.B. We can be 99% confident that the mean gross earnings for this sample of 30 Rolling Stones concerts lies in the intervalC. There is a 99% chance that the mean gross earnings of all Rolling Stones concerts lies in the intervalD. None of the above
Can you please help with part (b) of statistics question attached Please do not reject question if it is too complex for you and you do not know how to solve this problem. Allow another expert a chance to answer this question.
What can you determine from the two images and comparing the N, mean, st deviation, std error mean, F, sir, t, do, sig (2-tailed), mean difference, std error differences, and 95% confidence interval of the difference lower and upper. Please describe what you see from the data being presented
It is estimated that in the general population about 9 out of every 1000 or 0.009 children are diagnosed with autism. on study included 92 six month old babies who had a sibling with autism. twenty-eight of these babies were later diagnosed with autism. we will systematically construct a 99% confidence interval for the proportion of siblings of autistic children likely to have autism. What is the population being studied? What population parameter are we seeking to estimate? Describe this population parameter in words.
True or false? A researcher wants to estimate the impact prenatal care during pregnancy can have on premature deliveries by conducting a retrospective case-controlled study on new moms. If the prevalence of premature births is 10.9%, the researcher should enroll a total of 586 women in the study if the researchers want to construct a 90% confidence interval fir the difference in proportions that has a margin of error of no more than 3%.
How do we do it?
True or False? A researcher wants to be sure the mean difference in the change in blood pressure has a margin of error no more than 5 points and the difference in the standard deviation between the mean blood pressure points from the first medication used to treat high blood pressure and the second medication used to treat high blood pressure is 14 points. The desired sample size required to ensure a 95% confidence interval for the proposed study used to compare the efficacy of two medications used to treat high blood pressure during a cross-over trial is n = 31.
A large multinational corporation recently implemented an ERP system. A survey was done to determine the level of satisfaction with the new system. Out of the 350 managers surveyed, 280 indicated that they were satisfied. - What is the lower limit of the 95% confidence interval on the proportion of satisfied managers? (three decimal places) -What is the upper limit of the 95% confidence interval on the proportion of satisfied managers? (three decimal places)

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