Confidence Intervals

Statistics

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3. An advertisement for a new toothpaste states that 64% of users reported better dental checkups. The results of the poll are accurate within 3.4 percent points, 9 times out of 10. a) State the confidence level. b) Determine the confidence interval. c) If all 32 students in a mathematics class used this toothpaste, determine the range of the mean number of classmates who could expect better dental checkups.6. Toxic materials, such as arsenic, lead, and mercury, can be released into the air if a discarded cellphone is incinerated. Toxins can be released into groundwater if a discarded cellphone ends up in a landfill. In a recent survey, 89% of those surveyed answered yes to the following question: Would you recycle your cellphone if it were convenient? The survey is considered accurate to within 4.3 percent points, 99 times out of 100. a) Determine the confidence level and the confidence interval. b) If 23 500 000 people in Canada own cellphones, state the range of the number of people who would indicate that they would recycle their cellphone if it were convenient.1. A poll determined that 81% of people who live in Canada know that climate change is affecting Inuit more than the rest of Canadians The results of the survey are considered accurate within 3.1 percent points, 19 times out of 20. a) State the confidence level. b) Determine the confidence interval. c) The population of Canada was 33.5 million at the time of the survey. State the range of the number of people who knew that climate change is affecting Inuit more than the rest of Canadians,9. Use confidence intervals to interpret each of the following statements. a) In a recent survey, 54% of post-secondary graduates indicated that they expected to earn at least $100 000/year by the time they retire. The survey is considered accurate within 4.5%, 9 times in 10. b) A market research firm found that among online shoppers, 63% search for online coupons or deals when they purchase something on the Internet. The survey is considered accurate within +2.1 percent points, 99% of the time. c) A recent report indicated that Canadians spend an average of 18.1 h per week online, compared with 16.9 h per week watching television. The results are considered accurate with a margin of error of +3.38%, 19 times out of 20. d) A survey conducted at the expense of the political party that holds office indicated that 39% of decided voters said they would not vote for candidates of that party in the next election. The result is considered accurate within + 3%, 95% of the time