We are interested in conducting a study in order to determine what percentage of voters of a state would vote for the incumbent governor. What is the minimum sample size neede to estimate the population proportion with a margin of error 5% or less, at 95% confidence?

If 471 households were surveyed out of which 385 households have internet fiber cable, what is the sample proportion of households without fiber cable is (Round off the answer up to 3 decimal places)

About 79 % of college students support a "smoke free" campus initiative. What is the minimum sample size required so that the sampling distribution of the sample proportion is approximately normal? n = 51 n = 16 n = 48 n = 96

According to the Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft. This year, a certain state kept track of how many of its 1380 complaints were for identity theft. They want to know if the data provide enough evidence to show that this state had a different proportion of identity theft than 23%. State the sample statistic, population parameter, and hypotheses.a) The sample statistic in context is: Select an answer A randomly selected complaint filed with the FTC for that state. The percentage of 1380 randomly selected complaints filed with the FTC for that state that are for identity theft. The percentage of all complaints filed with the FTC for that state that are for identity theft. The mean number of all complaints filed with the FTC for that state that are for identity theft. The mean number of 1380 randomly selected complaints filed with the FTC for that state that are for identity theft. A randomly…

In preparing a report on the economy, we need to estimate the percentage of businesses that plan to hire additional employees in the next 60 days. How many randomly selected employers must we contact in order to create an estimate in which we are 99% confident with a margin of error of 6%? A sample size of is needed. (Round up to the nearest whole number.)

You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 1.5 percentage points of the true population percentage. Complete parts (a) and (b) below. 最籤服 a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.)

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…

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the​ Internet? Assume that we want to be 95​% confident that the sample percentage is within two percentage points of the true population percentage for all sales transactions. n= ​(Round up to the nearest​ integer.)

Income Tax and the IRS. In 2010, the Internal Revenue Service (IRS) sampled 308,946 tax returns to obtain estimates of various parameters. Data were published in Statistics of Income, Individual Income Tax Returns. According to that document, the mean income tax per return for the returns sampled was $11,266. a. Explain the meaning of sampling error in this context.b. If, in reality, the population mean income tax per return in 2010 was $11,354, how much sampling error was made in estimating that parameter by the sample mean of $11,266?c. If the IRS had sampled 400,000 returns instead of 308,946, would the sampling error necessarily have been smaller? Explain your answer.d. In future surveys, how can the IRS increase the likelihood of small sampling error?

A coach is interested in how many slam dunks the average college freshman at his university can do. Ten volunteers from the senior class step forward. After observing their performance, the coach concluded that college seniors can do an average of 10 slam dunks in a row without missing. what is the sample? what is the population?