You are a researcher for the National Highway Traffic Safety Administration (NHTSA) and wish toestimate the average blood alcohol concentration (BAC) for drivers involved in fatal accidents who arefound to have positive BAC values. You randomly select records from 572 such drivers and determinethe sample mean BAC to be 0.14. Assume that the known standard deviation is 0.07.What is the lower bound for a 95% confidence interval the true mean BAC for drivers involved in fatalaccidents?(Round your answer to three decimal places.)

Given that,The sample size is The sample mean BAC (Blood Alcohol Concentration) is The known…

Answered: You are a researcher for the National…

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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A study found a confidence interval on the proportion of children that are hearing impaired was 0.04 to 0.16. #1 What is p-hat in this study? #2 What is the margin of error for this confidence interval?
Please explain.
You want to find a 90% confidence interval for the mean height of students at your school. You somehow know that the standard deviation of student heights is 3.9. You want your margin of error to be no more than 0.3 inches. What is the minimum number of students whom you would need to measure? Submit Question
Find a 90% confidence interval for the population mean age of the Smurfs if a sample of 52 smurfs have a mean age of 49.7 years. The standard deviation is know to be 3.4. The Margin of Error (3 decimals) is E = . The answer is We are 90% confident the true mean age of Smurfs is between and years.
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You plan to build a 95% confidence interval estimate of the mean of a large population. You want a margin of error no larger than +10. You estimate the population standard deviation to be 200. How large a sample is needed?
We wish to estimate what percent of adult residents in a certain county are parents. Out of 400 adult residents sampled, 72 had kids. Based on this, construct a 95% confidence interval for the proportion, p, of adult residents who are parents in this county.Give your answers as decimals, to three places.
Step 4 (b) Find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site. To find a confidence interval for the mean of all tree-ring dates from this archaeological site, you will need a point estimate for u, and you will either need to know the population standard deviation or estimate it in order to calculate the margin of error. In the previous step you calculated the sample mean, x = 1,263.0000. Use this as your point estimate for p. You also calculated the sample standard deviation, s = 43.2637. To compute a confidence interval for u, you will need a critical value from Student's t distribution vwith n- 1 degrees of freedom. This number, t,, is the number such that an area equal to c under the t curve falls between -t and t. Use the table to find the critical value for a confidence level of 90%. We found earlier that n = 9, thus the degrees of freedom are n- 1 = 8 Use the table to find t. to.90 90 Submit Skip (you cannot come back)
Suppose we wish to construct a 95% confidence interval for the population proportion of fans in Notre Dame Stadium on a football Saturday who traveled in their own car. When we asked 200 randomly selected fans, 130 answered yes. Calculate the margin of error for this interval. Round your answer to 3 decimal places.
The accompanying table shows the number of cars sold last month by seven employees at a car dealership and their number of years of sales experience. Management would like to use simple regression analysis to estimate monthly car sales using the number of years of sales experience. What conclusion can be drawn from the 95% confidence interval for the slope? E Click the icon to view the car sales data. O A. Because the confidence interval does not include zero, there is supporting evidence to condlude that a linear relationship does exist between number of cars sold and number of years of sales experience. O B. Because the confidence interval includes zero, there is supporting evidence that no linear relationship exists between number of cars sold and number of years of sales experience. OC. The dealership can be 95% confidence that for each year of sales experience a salosperson has acquired, monthly sales will increase by 1.7 to 12.2 cars. OD. The dealership can be 95% confident that…
We wish to estimate what percent of adult residents in a certain county are parents. Out of 200 adult residents sampled, 134 had kids. Based on this, construct a 99% confidence interval for the proportion, p, of adult residents who are parents in this county.Give your answers as decimals, to three places.
If n = 20, the sample mean = 250, SD = 15, SEM = 3.354, what is the confidence interval (using 95% confidence level). What percent confidence do you have that the population mean is between what two values

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