3. The American Medical Association (AMA) wishes to determine the percentageof obstetricians who are considering leaving the profession because of the rapidlyincreasing number of lawsuits against obstetricians. How large a sample shouldbe taken to find the answer to within ±3% at the 95% confidence level?(A) 6(B) 33(С) 534(D) 752(E) 1068

Formula for the sample size needed to estimate a population proportion is

Answered: 3. The American Medical Association…

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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8. Solve for the following questions correctly please
40 - It is known that the main mass variance of product X produced in an electronic card factory is 1600 and the number of products that should be included in the sample is 230. How many days should the difference between the average of the population and the sample average be at the 95% confidence level? a) 4 B) 3 NS) 5 D) 6 TO) 7
7.88 Suppose that a survey of race fans at this week's Daytona 500 NASCAR race were asked, Is this your first time attending the Daytona 500? From a ran- dom sample of 250 race fans, 100 answered in the affirmative. a. Find the standard error to estimate the population proportion of first timers. b. Find the sampling error to estimate the population proportion of first timers with 95% confidence level. c. Estimate the proportion of repeat fans with 92% confidence level.
11. a. The manufacturers are interested in estimating the percentage of defective light bulbscoming from a certain process. They want a 90% confidence interval with a margin of error of 2%. How many light bulbs must they test?Choices:(a) 50 (b) 500 (c) 800 (d) 2000 (e) 300011. b. Same question as in the previous problem, but assume they had a reason to believe the proportion is fairly close to 6%. How large a sample must they test?Choices:(a) 50 (b) 500 (c) 800 (d) 2000 (e) 3000
Determine the sample size necessary to estimate p for the following information. a. E = 0.04, p is approximately 0.30, and confidence level is 96% b. E is to be within 0.03, p is unknown, and confidence level is 95% c. E is to be within 5%, p is approximately 56%, and confidence level is 90% d. E is to be no more than 0.02, p is unknown, and confidence level is 99% Appendix A Statistical Tables (Round answers to 0 decimal places, e.g. 5,125.) a. Sample size = b. Sample size = c. Sample size d. Sample size
4. A new procedure for the determination of sulfur in coal was tested on a standard coal sample with a certified value of 2.14% sulfur by mass. The new procedure gave results of 2.11%, 2.07%, 2.04%, 2.06%, and 2.16% for five separate determinations. a) Does the new procedure give the correct result at the 95% confidence level? b) Does the new procedure give the correct result at the 90% confidence level? c) Based on your answers to parts (a) and (b), fill in the blank in the following statement: There is at least a % chance that the difference between the certified value and the values obtained by the new procedure is due to random error.
8) Research published in the Journal of Quantitative Criminology (Mar. 2010) revealed that the risk of burglaries in homes located on cul-de-sacs is lower than from homes on major roads. What size sample would be required to estimate the population proportion of cul-de-sac homes in your home city that were burglarized in the past year within 2% at the 99% confidence level?
The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that receive welfare. A preliminary sample showed that 19.5% of households in this sample receive welfare. The sample size that would limit the margin of error to be within 0.022 of the population proportion is:
3. Michael wants to make a confidence interval estimate for the proportion of community members in favor of a tax increase for more local school funding. If he wants the margin of error to be no more than 0.025 at a 90% confidence level b) Suppose he guesses that about 30% are in favor for the tax increase. What will be the required sample size in this case? Assume the same margin of error and confidence level.
7) A group of 39 randomly selected students have a mean score of 19.5 with a standard deviation of 3.2 on a placement test. What is the 99% confidence interval for the mean score, μ, of all students taking the test? O 27.9 μ< 31.9 O 18.2 μ< 20.8 28.2 μ< 30.8 O 18.1 μ< 20.9
5. A news station would like to conduct an exit poll to determine the likelihood that a highly debated amendment will receive enough support to pass. The news station plans to construct a 90 percent. confidence interval to estimate the proportion of voters supporting the amendment. Which of the following expressions would give the smallest sample size that will result in a margin of error of no more than 3 percentage points? (A) (A) (0.5)| (1.645) 0.03 1.645v (B) (0.5)2 0.03 (C) (0.5)² ( 1.645 0.06, (D) (D) ) (0.5)² (1.99) (E) (0.5)2( (1.96) 0.06/

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