Fewer young people are driving. In 1995, 63.9% of people under 20 years old who were eligible had a driver's license. Bloomberg reported that percentage haddropped to 41.7% in 2016. Suppose these results are based on a random sample of 1,200 people under 20 years old who were eligible to have a driver's licensein 1995 and again in 2016.a. At 95% confidence, what is the margin of error and the interval estimate of the number of eligible people under 20 years old who had a driver's license in1995?Margin of error(to four decimal places)Interval estimateto(to four decimal places)b. At 95% confidence, what is the margin of error and the interval estimate of the number of eligible people under 20 years old who had a driver's license in2016?Margin of error =(to four decimal places)Interval estimate =to(to four decimal places)c. Is the margin of error the same in parts (a) and (b)?- Select your answer vWhy, or why not?

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Answered: Fewer young people are driving. In…

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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In studying his campaign plans, Mr. Singleton wishes to estimate the difference between men's and women's views regarding his appeal as a candidate. He asks his campaign manager to take two random independent samples and find the 80%80% confidence interval for the difference. A random sample of 508508 male voters and 605605 female voters was taken. 108108 men and 193193 women favored Mr. Singleton as a candidate. Find this confidence interval. Step 2 of 4 : Find the critical value that should be used in constructing the confidence interval.
OA USA Today/CNN/Gallup survey of 365 working parents found 195 who said they spend too little time with their children because of work commitments. a. What is the polnt estimate of the proportion of the population of working parents who feel they spend too little time with their children because of work commitments? (to 4 decimals) b. At 95% confidence, what is the margin of error? (to 4 decimals) c. What is the 05% confidence interval estimate of the population proportion of working parents who feel they spend too little time with their children because of work commitments (to 4 decimals)?
In studying his campaign plans, Mr. Singleton wishes to estimate the difference between men's and women's views regarding his appeal as a candidate. He asks his campaign manager to take two random independent samples and find the 80%80% confidence interval for the difference. A random sample of 508508 male voters and 605605 female voters was taken. 108108 men and 193193 women favored Mr. Singleton as a candidate. Find this confidence interval. Step 1 of 4 : Find the values of the two sample proportions, pˆ1�^1 and pˆ2�^2. Round your answers to three decimal places.
Question: In a certain factory there are two independent processes manufacturing the same item. The average weight in a sample of 250 items produced from one process is found to be 120 ozs. with a standard deviation of 12 ozs. while the corresponding figures in a sample of 400 items from the other process are 124 and 14. Obtain the standard error of difference between the two sample means. Is this difference significant ? Also find the 99% confidence limits for the difference in the average weights of items produced by the two processes respectively.
Pop. Mean Stand. Dev. Sample size 1 73.00 10.00 6.00 14 2 62.50 8 1.Independent random samples are selected from two populations. Below are selected summary statistics. (a) Construct the 95% confidence interval for μx-µY. (b) Obtain the P-value for the alternative µx =µY.
technology to answer uns estion. A research center has conducted extensive research on social media usage. One finding was that 73% of adults aged 18 to 24 use Snapchat. Another finding was that 44% of those aged 18 to 24 use Twitter. Assume the sample size associated with both findings is 600. (a) Develop a 95% confidence interval for the proportion of adults aged 18 to 24 who use Snapchat. (Round your answers to four decimal places.) to (b) Develop a 99% confidence interval for the proportion of adults aged 18 to 24 who use Twitter. (Round your answers to four decimal places.) to (c) In which case, part (a) or part (b), is the margin of error larger? Explain why. The margin of error is larger in part (b) ✓for two reasons. The sample proportion of adults aged 18 to 24 who use Twitter is ---Select--than the sample proportion of adults aged 18 to 24 who use Snapchat. Therefore, the standard error of the former is ---Select--than the standard error of the latter. In addition, Z/2 for a…
1. The manager at Bell's Gym wants to know the proportion of members who use the Cardio Machines. A sample of 260 members showed that 40 of them use cardio machines. Calculate a 97% confidence interval for the proportion of members who use the cardio machines.
4) Early study results show that 80% of customers are willing to pay an extra dollars on their purchase to a local charity. If the margin of error is 0.012 at 95% confidence, find how many customers are surveyed.
In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes. A telephone company wants to perform a test to determine whether this average duration of long- distance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes. ∑ ? = 205 ∑(? − ?̅)2 = 56.43 Calculate the sample mean, ?̅. Calculate the sample standard deviation.
Is it true or false that the least absolute deviations (LAD) estimator minimizes the sum of the absolute value of the population errors.
A market researcher states that she has 90% confidence that the mean monthly sales of a product are between $190,000 and $220,000. Explain the meaning of this statement. Choose the correct answer below. O A. If all possible samples of the same size, n= 100, are taken, 90% of those samples will result in a 90% confidence interval that includes the true population mean. Therefore, she is 90% confident that this sample is one that does correctly estimate the mean. O B. A 90% confidence interval contains 90% of the possible sample means. Therefore, she is 90% confident that the interval contains the true population mean. OC. Ifa month was selected, there would be a 90% probability that the mean monthly sales value was within the confidence interval that the researcher found, so the researcher is 90% confident that the true population mean of monthly sales is within the interval. O D. A 90% confidence interval contains 90% of all monthly sales values in the population, so she is 90%…
Question: In a survey of buying habits, 400 women shoppers are chosen at random in super market 'A' located in a certain section of the city. Their average weekly food expenditure is dollar 250 with a standard deviation of Dollar 40. For 400 women shoppers chosen at random in super market 'B' in another section of the city, the average weekly food expenditure is Dollar 220 with a standard deviation of Dollar 55. Test at 1% level of significance whether the average weekly food expenditure of the two populations of shoppers are equal.

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