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99% . As the level of confidence increases, the width of the confidence interval increases
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Question 7 1 pts A researcher wants to use a confidence interval to estimate the proportion...
A researcher wants to use a confidence interval to estimate the proportion of college students in...
A researcher wants to use a confidence interval to estimate the proportion of college students in his state who plan to vote in the 2020 presidential election. He plans to randomly sample 120 college students, and plans to construct a 95% or 99% confidence interval. Which of these confidence intervals will be wider, and why? Group of answer choices _99%. As the level of confidence increases, the width of the confidence interval increases. _95%. As the level of confidence decreases,...
6. (2 points) One researcher wants to construct a 99% confidence interval as part of a...
6. (2 points) One researcher wants to construct a 99% confidence interval as part of a study. A colleague says such a high level is not necessary and that a 95% confidence level will suffice. In what ways will these intervals differ? Give two statements.
3. Suppose a researcher believes that college faculty vote at higher rate than college students. She...
3. Suppose a researcher believes that college faculty vote at higher rate than college students. She collects data from 200 college faculty and 200 college students using simple random sampling. If 167 of the faculty and 138 of the students voted in the 2008 Presidential election, (A) Find a 90% confidence interval for the difference between the proportion of faculty and the proportion of students who vote. (b) Is there enough evidence at the 3% level of significance to support...
Question 9 (1.5 points) A medical researcher wants to construct a 99% confidence interval for the...
Question 9 (1.5 points) A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result in complications. An article in the Journal of Bone and Joint Surgery suggested that approximately 8% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of o.023 2 Write only an integer as your answer. Your Answer Answet Save Question 10...
Question 19 (5 points) A pollster wants to construct a 95% confidence interval for the proportion...
Question 19 (5 points) A pollster wants to construct a 95% confidence interval for the proportion of adults who believe that economic conditions are getting better. A Gallup poll taken in July 2010 estimates this proportion to be 0.33. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.039? Write only an integer as your answer. Your Answer: Answer Question 20 (5 points) A researcher wants to construct a...
A researcher found a 95% confidence interval for the proportion of college students who believe in...
A researcher found a 95% confidence interval for the proportion of college students who believe in ghosts. The interval was (0.6525, 0.7535). What is the margin of error for this estimate?
A researcher in campaign finance law wants to estimate the proportion of elementary, middle, and high...
A researcher in campaign finance law wants to estimate the proportion of elementary, middle, and high school teachers who contributed to a candidate during a recent election cycle. Given that no prior estimate of the population proportion is available, what is the minimum sample size such that the margin of error is no more than 0.03 for a 95% confidence interval?
Use the given degree of confidence and sample data to construct a confidence interval for the...
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Round to three decimal places When 310 college students are randomly selected and surveyed, it is found that 112 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car. O A. 0.291 <p<0.432 OB. 0.298 <p<0.425 OC. 0.316<p<0.406 OD. 0.308<p <0.415
part 1. A student was asked to find a 95% confidence interval for the proportion of...
part 1. A student was asked to find a 95% confidence interval for the proportion of students who take notes using data from a random sample of size n = 79. Which of the following is a correct interpretation of the interval 0.12 < p < 0.32? There is a 95% chance that the proportion of notetakers in a sample of 79 students will be between 0.12 and 0.32. There is a 95% chance that the proportion of the population...
Use the given degree of confidence and sample data to construct a confidence interval for the...
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Round to three decimal places. When 263 college students are randomly selected and su ve ed, it is found that 121 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car O A. 0.410 sp<0.511 OB, 0.388 <p<0532 O C. 0.381p<0.539 OD. 0.400<p<0520
6. (2 points) One researcher wants to construct a 99% confidence interval as part of a study. A colleague says such a high level is not necessary and that a 95% confidence level will suffice. In what ways will these intervals differ? Give two statements.
3. Suppose a researcher believes that college faculty vote at higher rate than college students. She collects data from 200 college faculty and 200 college students using simple random sampling. If 167 of the faculty and 138 of the students voted in the 2008 Presidential election, (A) Find a 90% confidence interval for the difference between the proportion of faculty and the proportion of students who vote. (b) Is there enough evidence at the 3% level of significance to support...
Question 9 (1.5 points) A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result in complications. An article in the Journal of Bone and Joint Surgery suggested that approximately 8% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of o.023 2 Write only an integer as your answer. Your Answer Answet Save Question 10...
Question 19 (5 points) A pollster wants to construct a 95% confidence interval for the proportion of adults who believe that economic conditions are getting better. A Gallup poll taken in July 2010 estimates this proportion to be 0.33. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.039? Write only an integer as your answer. Your Answer: Answer Question 20 (5 points) A researcher wants to construct a...
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Round to three decimal places When 310 college students are randomly selected and surveyed, it is found that 112 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car. O A. 0.291 <p<0.432 OB. 0.298 <p<0.425 OC. 0.316<p<0.406 OD. 0.308<p <0.415
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. Round to three decimal places. When 263 college students are randomly selected and su ve ed, it is found that 121 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car O A. 0.410 sp<0.511 OB, 0.388 <p<0532 O C. 0.381p<0.539 OD. 0.400<p<0520
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