A survey of 2,950 Filipinos showed that 2,655 trust the Supreme Court decisions on legal issues. Compute a 99% confidence interval for the proportion of Filipinos who trust the Supreme Court decisions on legal issues. Answer: 88.6% to 91.4 %
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- What is meant by the sample space of an experiment?in a survey of 2230 adults, 57% thinks that land travel through a tourist bus is much more reliable than taking personal van. At a 95% confidence level, what is the lower confidence limit percentage of all adults who think that taking a tourist bus is much more reliable than taking a personal van.calculate a 95% confidence interval for the proportion of U.S residents who feel that the united states is on the right track in terms of its foreign policy if a random sample of 400 such residents had 148 respond yes
- A pharmaceutical company is testing two distinct drugs to alleviate symptoms of a disease. In the trials of the first drug, 115 of 425 experience relief. In the second, 120 of 550 experience relief. At a 95% confidence level, test if there is there a significant difference in the drugs?In a poll of 2,500 likely voters, 966 say that the Philippines spend too little on education. Find the 90% confidence interval of the true proportion of voters who feel this way.Wisconsin Public Radio wants to duplicate a survey conducted in 2011 that found that 68% of adults living in Wisconsin felt that the country was going in the wrong direction. How many people would need to be surveyed for a 90% confidence interval to ensure the margin of error would be less than 3%?
- A joint USA Today/CNN/Gallup Poll in July 2020 indicated that of 832 white adults, 46% thought affirmative action has been good for the country and 44% thought it had not been good; the remaining 10% were undecided. Construct and interpret a 95% confidence interval for the true proportion of American white adults believing that affirmative action has been good.In a recent Zogby International Poll, nine of 48 respondents rated the likelihood of a terrorist attack in their community as “likely” or “very likely”. Use the “plus four” method to create a 98% confidence interval for the proportion of American adults who believe that a terrorist attack in their community is likely or very likely. Interpret your confidence interval.A tech company believes that the percentage of residents in the town XYZ that own a cell phone is 70%. A marketing manager believes the value to be different. He conducts a survey of 200 individuals and found that 130 responded yes to owning a cell phone. At a 95% confidence level, is there enough evidence to reject the null hypothesis.
- A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that the local regulations obstruct their business. a) Construct and interpret a 95% confidence interval based on this sample.One hundred fifty high school students were surveyed, and it was found that 68% of them are using the internet for a minimum of 3 to 5 hours a day. a. If we want a margin of error of 3%, how many students do we need to construct a 95% confidence interval for the proportion of the students who are using the internet for a minimum of 3 to 5 hours a day? b.With 95% confidence interval, what interpretation can we make regarding the proportion of the students who are using the internet for a minimum of 3 to 5 hours a day?