A large city is considering a voter referendum on a plastic bag ban. They plan on surveying residents to estimate the proportion in favor of a ban. Two internsgoes through the voter registry alphabetically and call the first 100 names they find. Which of the assumptions and conditions for finding and interpretingthe confidence interval were not met?A. The independence assumption.B. The randomization condition.C. The 10% condition.D. The success/failure condition.E. All of the assumptions and conditions were met.O AOOBOE

A significant city may hold a plastic bag prohibition referendum. They will survey residents to…

Answered: A large city is considering a voter…

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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Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054 use a social networking site.7 Find and interpret a 95% confidence interval for each of the following proportions: (a) Proportion of US adults who use the Internet regularly. (b) Proportion of US adult Internet users who use a social networking site. (c) Proportion of all US adults who use a social networking site. Use the confidence interval to estimate whether it is plausible that 50% of all US adults use a social networking site.
Trainers at a dog training facility find want to know how successful their recently updated program is. They randomly select 250 owners with dogs who went through the program and ask if they consider their dog well- behaved; 100 say yes. If the trainers want a margin of error of around 4%, which of the confidence levels below should they use? O 98% O 90% O 99% O 95% o o
Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)
A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 3% margin of error at a 98% confidence level, what size of sample is needed? The political candidate will need to sample people.
Safety. Observers in Texas watched children at playin eight communities. Of the 814 children seen biking,roller skating, or skateboarding, only 14% wore a helmet.a) Create and interpret a 95% confidence interval.b) What concerns do you have about this study thatmight make your confidence interval unreliable? c) Suppose we want to do this study again, picking vari-ous communities and locations at random, and hope to end up with a 98% confidence interval having amargin of error of {4,. How many children mustwe observe?
A college administrator is interested in determining the proportion of students who receive some sort of financial aid. Instead of examining the records for all students, the administrator randomly draws 120 students and finds that 48 of them are receiving financial aid. Use a 90% confidence interval to estimate the true proportion of students who receive financial aid.
A political scientist claims that 38% of first-year college students characterize themselves as being “moderate” or “middle of the road” as far as their political affiliation is concerned. Believing this claimed value is too high, you survey a random sample of 400 first-year college students and find that 120 characterize themselves as being “moderate” or “middle of the road.” Based on this information, what will the test statistic be? Choose the answer below that is closest to what you calculate, and try not to do a lot of rounding until you get to the very end of your calculations. 1. -0.3 2. -1.2 3. -2.6 4. -3.3 5. None of the other answer options are correct because the test statistic should be positive, not negative.
A political researcher takes a survey of 310 randomly selected registered voters in Orlando, and each person was asked who they plan on voting for in the 2024 presidential election. 110 said they plan on voting for Candidate A, 185 said they plan on voting for Candidate B, and 15 were unsure or plan to vote for another candidate. The researcher wants to construct a 95% confidence interval for the proportion of all registered voters in Orlando who plan to vote for Candidate B. What is the point estimate? Round final answer to 3 decimal places.

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