A survey of 2297 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 426 have donated blood in the past two years. Complete parts (a) through (c) below.(a) Obtain a point estimate for the population proportion of adults in the country aged 18 and older who have donated blood in the past two years.p=(Round to three decimal places as needed.)(b) Verify that the requirements for constructing a confidence interval about p are satisfied.The samplea simple random sample, the value ofis. which is10, and theless than or equal to 5% of the(Round to three decimal places as needed.)(c) Construct and interpret a 90% confidence interval for the population proportion of adults in the country who have donated blood in the past two years. Select the correct choice below and fill in any answer boxes within yourchoice.(Type integers or decimals rounded to three decimal places as needed. Use ascending order.)O A. There is a% chance the proportion of adults in the country aged 18 and older who have donated blood in the past two years is betweenandO B. We are% confident the proportion of adults in the country aged 18 and older who have donated blood in the past two years is betweenandStatcrunchNextO8:00SAMSUNGesc%23$%&backspace1246.7tab*00 A researcher wishes to estimate the average blood alcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC values. He randomly selects records from 75 such drivers in 2009 anddetermines the sample mean BAC to be 0.17 g/dL with a standard deviation of 0.080 g/dL. Complete parts (a) through (d) below.(a) A histogram of blood alcohol concentrations in fatal accidents shows that BACS are highly skewed right. Explain why a large sample size is needed to construct a confidence interval for the mean BAC of fatal crashes with apositive BAC.O A. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is needed to ensure that it contains at least 5% of the population.O B. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is needed to minimize the margin of error to ensure only the peak of the sampling distribution is captured in the confidenceinterval.O C. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is necessary to ensure that the distribution of the sample mean is approximately normal.O D. Since the distribution of blood alcohol concentrations is highly skewed right, a large sample size is needed to maximize the margin of error to ensure that both tails are accounted for in the confidence interval.(b) Recently there were approximately 25,000 fatal crashes in which the driver had a positive BAC. Explain why this, along with the fact that the data were obtained using a simple random sample, satisfies the requirements forconstructing a confidence interval.O A. The sample size is likely greater than 10% of the population.O B. The sample size is likely greater than 5% of the population.O C. The sample size is likely less than 10% of the population.O D. The sample size is likely less than 5% of the population.(c) Determine and interpret a 90% confidence interval for the mean BAC in fatal crashes in which the driver had a positive BAC. Select the correct choice below and fill in the answer boxes to complete your choice.(Use ascending order. Round to three decimal places as needed.)StatcrunchNext8:00SAMSUNGesc@%23$%&12346.78.backspacetabWeVO

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A survey of 2297 aduts in a certain large country aged 18 and older conducted by a reputatie poling organization found that 426 have donated blood in the past two years. Complete parts (a) thvough (c) below (a) Obtain a point estimate for the population proportion of adults in the country aged 18 and older who huve donated blood in the past two years. (Round to three decimal places as needed.) (b) Venty that the requirements for constructing a confidence interval about p are satisfied The sampie a simple random sample, the value of is. which is 10, and the less than or equal to 5% of the (Round to three decimal places as needed) (c) Cornstruct and interpret a 90% confidence interval for the population proportion of aduits in the country who have donated blood in the past two years. Select the correct choice below and fill in any answer boxes within your choice (Type integers or decimals rounded to three decimal places as needed. Use ascendng order) OA There is a % chance the proportion of adults in the country aged 18 and older who have donated blood in the past two years is between and OB We are % contident the proportion of adults in the country aged 18 and older who have donated blood in the past two years is betwoen and

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P