Question fourA poll was conducted in a very small community in country X to see if residents arefor or against a policy that requires them to continue wearing masks after taking thevaccine. A total of 500 persons were surveyed. Of the 500 surveyed, 200 are againstcontinuing to wear a mask. Compute a 90% confidence interval for the true percent ofresidents who are against the new policy, and interpret the confidence interval.

Answered: Image /qna-images/answer/3d8ab6c5-1ce3-457e-8700-b5e1080b7be2.jpg

Answered: A poll was conducted in a very small…

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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Trader Moe's is considering opening a Fayetteville location but their development office has learned that a main competitor, The Whole Market, currently has a store in development here. Trader Moe's conducts a survey to see which store shoppers would choose if both were available within a 5 mile radius. Out of 200 shoppers surveyed, 73 would go to Trader Moe's. Assunming the 95% confidence interval for those who would choose Trader Moe's. What would happen to the confidence interval if a 99% confidence level were used? The interval would move to the right along the distribution It would be narrower than the 95% confidence interval The interval would move to the left along the distribution It would be wider than the 95% confidence interval
Ms. Rains believes more seniors from PLD plan to attend college than seniors at Lafayette. In a random sample of 35 PLD seniors, 21 responded they plan to attend college. In a random sample of 32 Lafayette seniors only 17 responded they plan to attend college. Using a 95% confidence interval, predict the true difference in the proportion of seniors at PLD and Lafayette who plan to attend college and comment on Ms. Rains' belief.
A computer store near campus is stocking its shelves and wants to know the relative proportions of students who use PCs vs Macs. A random sample of 60 students is surveyed, and each student is asked whether they use a PC or Mac more often. 55% select ”PC.” (a) What is the population and what is the sample in this study? (b) Calculate a 95% confidence interval for the proportion of UCI students that are PC users. (c) Provide an interpretation of this confidence interval in the context of this problem. (d) The confidence interval is pretty wide and leaves a lot of uncertainty over the proportion of UCIundergarduates who use PCs. With the goal to estimate a narrower 95% confidence interval, what is a simple change to this study that you could suggest for the next time that a similar survey is conducted?
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 360 babies were born, and 324 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, does the method appear to be effective?
A study would like to investigate the risk of lung cancer in url. area and rural area. Assume the proportion of urban residents with lung cancer is p1, and the proportion of rural area residents with lung cancer is p2. If it is found that 20 of 200 adults in an urban community have lung cancer and 10 of 150 adults in the rural community have lung cancer. Find the 95% confidence interval for the difference in the proportions. Would you conclude that p1 is greater than p2? Select all correct answers. O "O" is not in the interval (C.I) O Yes, we can conclude p1 is greater than p2. O "0.1" is in the interval (C.I) O "O" is in the interval (C.I) Not enough information is given. O (-0.02431, 0.090972) O (21.48721, 22.90809) O No, we can't conclude p1 is greater than p2. O "0.1" is not in the interval (C.I) (-1.21908, 2.64790) O (-19.20998, -17.21458) Previous hp
An economist at the Florida Department of Labor and Employment needs to estimate the unemployment rate in Indian River county. The economist found that 3.09% of a random sample of 632 county residents were unemployed.Find three different confidence intervals for the true proportion of Indian River county residents who are unemployed. Calculate one confidence interval with a 95% confidence level, one with a 96% confidence level, and one with a 97% confidence level. Notice how the confidence level affects the margin of error and the width of the interval.Report confidence interval solutions using interval notation. Express solutions in percent form, rounded to two decimal places, if necessary.The margin of error for a 95% confidence interval is given by E =.A 95% confidence interval is given by:
Several years ago, 45% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,025 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,025 surveyed, 484 indicated that they were satisfied. Construct a 99% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed.
A general merhandise chain store wants to know if two if its local stores’ sales profiles are similar to that of the general chain. The general daily revenue of the chain is $ 93.5 daily (in thousands) per store. The chain is tracking the sales of each store. The CEO sends two accountants to the stores below to quantify with 95% confidence whether Store A has less sales and store B has more sales in comparison to the general chain’s store profile For the following questions assume that the overall standard deviation is equal to $8 and the chain has data from 100 samples. The chain decides to generalize the inspection scheme and settles for a lenient comparison threshold of 90% confidence. Find a confidence interval of daily revenue for the stores of the entire chain. For a randomly selected store, on a randomly selected date, what is the probability of having a revenue larger than $ 95 ? On a randomly selected date, for a randomly selected store, at most how much revenue is expected…
A recent provincial report states that 90% of the population is aware that piercings as well as tattoos can transmit infectious disease. A survey was conducted in the province and random subjects were asked if they knew that piercings as well as tattoos could transmit an infectious disease. Following this, 1450 people responded with "yes" and 48 responded with "no". Find the 95% confidence interval estimate of the proportion of those who know that piercings as well as tattoos can transmit an infectious disease.
Find the critical value for a 98% confidence interval. Then calculate the interval.
A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new medication or a placebo. The outcome is pain relief within 30 minutes. Generate a 95% confidence interval for the proportion of patients on the new medication who report paint relief. Generate a 95% confidence interval for the difference in proportions of patients who report pain relief. Pain Relief No Pain Relief New Medication 44 76 Placebo 21 99

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