Out of a sample of 650 high school students, 321 take the bus to school every day. Construct a 99% confidence interval for the population mean of high school students that take the bus to school every CI = (46.16%, 52.61%) CI = (44.34%, 54.43%) CI=(45.54%, 53.23%) OCI = (43.23%, 51.18%)
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- What is meant by the sample space of an experiment?A survey of 80 recent arcanum students showed that 46 were ready for summer break. Find the 95% confidence interval of the true proportion of students ready for summer break.A random sample of 25 statistics students was asked: “Have you smoked a cigarette in the past week?” Six students reported smoking within the past week. Use the “plus-four” method to find a 95% confidence interval for the true proportion of statistics students who smoke.
- 2. Of 124 adults randomly selected from one town, 27 of them smoke. Construct a 99% confidence interval for the percentage of all adults in this town who smoke. 12.2% < p < 31.3% 13.1% < p < 30.4% 15.7% < p < 27.9% 14.5% < p < 29.0% Correct answer is not givenIn a random sample of 50 patients undergoing a standard surgical procedure, 15 required medication for post operative pain. In a random sample of 90 patients undergoing a new procedure, only 16 required pain medication. a)Are conditions met to perform inference onthis study? b)Construct and interpret a 95% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures. c) A physician claims that the proportion of patients who need pain medication is the same for both procedures. Does the confidence interval contradict this claim? Why/Why not?Using the data from the 2018 professional baseball season, the American League (AL) had 10 players bat over .300 out of 179 players who played at least 82 games. In the national League (NL), there were 10 players who batted over .300 out of 196 players who played at least 82 games. Find a 90% confidence interval for the difference in porportion of .300+ hitters in the AL and NL.
- 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 yesA local health centre noted that in a sample of 400 patients, 80 were referred to them by the local hospital. a. Provide a 95% confidence interval for all the patients who are referred to the health centre by the hospitalAlma is estimating the proportion of students in her school district who, in the past month, read at least 1 book. From a random sample of 50 students, she found that 32 students read at least 1 book last month. Assuming all conditions for inference are met, which of the following defines a 90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month?
- According to a survey of 673 small business participants in the Constant Contact Small Biz Council in May of 2013, 384 of the respondents say it is harder to run a small business now than it was 5 years ago. When estimating the population proportion, what is the 95% confidence interval estimating the proportion of businesses who believe it is harder to run a business now than 5 years ago? a) (0.53318 , 0.60798) b) (-0.53318 , 0.60798) c) (0.5515 , 0.58966) d) (0.54919 , 0.59196) e) (0.39202 , 0.46682)The National Sporting Goods Association found that 34% of Americans surveyed had gone swimming during the year. Assuming that the survey included a simple random sample of 1200 persons, construct a 95% confidence interval for the population proportion of Americans who went swimming during the year.A new television series must prove that it has more than 25% of the viewing audience after its initial 13-week run in order to be judged successful. Assume that in a sample of 400 households, 112 were watching the series. (b) Find a 99% confidence interval for the proportion of the viewing audience after its initial 13-week run