A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think the president of their country can control the price of gasoline. Her estimate must be accurate within 3% of the true proportion. a) No preliminary estimate is available. Find the minimum sample size needed. b) Find the minimum sample size needed, using a prior study that found that 38% of the respondents said they think their president can control the price of gasoline. c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n3D (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 38% of the respondents said they think their president can control the price of gasoline? n3= = (Round up to the nearest whole number as needed.) (c) How do the results from (a) and (b) compare? O A. Having an estimate of the population proportion raises the minimum sample size needed. O B. Having an estimate of the population proportion reduces the minimum sample size needed. O C. Having an estimate of the population proportion has no effect on the minimum sample size needed.

A programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 95​% confident that his estimate is in error by no more than three percentage points? Complete parts​ (a) through​ (c) below.Question content area bottomPart 1​a) Assume that nothing is known about the percentage of computers with new operating systems. n=enter your response here ​(Round up to the nearest​ integer.)Part 2​b) Assume that a recent survey suggests that about 96​% of computers use a new operating system.n=enter your response here ​(Round up to the nearest​ integer.)Part 3​c) Does the additional survey information from part​ (b) have much of an effect on the sample size that is​ required?A.​Yes, using the additional survey information from part​ (b) dramatically reduces the sample size.B.​Yes, using the additional survey information…

You are doing a research project in political science to determine the proportion of voters in your district who favor capital punishment. a. If no preliminary sample of voters is taken to estimate p, how large a sample is necessary to be 99% sure that the point estimate will be within a distance of .01 from p? b. The NORC found that approximately 67% of people in the U.S. favor capital punishment. How large a sample is necessary to be 99% sure that the point estimate will be within a distance of .01 from p?

In order to gauge public opinion about how to handle Iran's growing nuclear program, a research group surveyed 996 American men by telephone and asked them to rate the threat Iran's nuclear program poses to the world on a scale of 1 to 10. Describe the population, sample, population parameters, and sample statistics Identify the population in the given problem. Choose the correct answer below. O A. The 996 American men surveyed by telephone O B. Half of all American men O C. All American men O D. Some of the 996 American men surveyed by telephone Identify the sample for the given problem. Choose the correct answer below. O A. Half of all American men O B. The 996 American men surveyed by telephone C. All American men O D. Some of the 996 American men surveyed by telephone Identify the population parameter in the given study. Choose the correct answer below. O A. The mean threat rating of all American men on Iran's nuclear program O B. The mean threat rating on Iran's nuclear program of…