HOLY BIBLECollege tuition: A simple random sample of 35Colleges and universities in the united states hada mean tuition of $18,702 with a standarddeviation of $10,653. Construct a 95% Confidenceinterval for the mean tuition for all Colleges andUniversities in the united states.

Given,sample size(n)=35sample mean(x¯)=18702standard deviation(s)=10653degrees of…

Answered: College tuition: A simple random sample…

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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Energy drinks come in different-sized packages: pouches, small bottles, large bottles, twin-packs, 6-packs, and so on. How is the price related to the amount of beverage? Data collected on a variety of packages revealed a mean size of 140.17 ounces with a standard deviation of 78.23 ounces. The packages had an average price of $3.66 with a standard deviation of $1.50, and the correlation between size and price was r= 0.91. A scatterplot of these data suggested that the assumptions needed for regression were reasonable. a) Interpret the value of r in context. b) Compute the slope of the regression line for predicting the price of an energy drink. Include the proper units in your answer. c) Write the equation for the least-squares regression line for these data. d) If the price was in Euros instead of US dollars, what would be the correlation between size and price? Explain. e) For this model the standard deviation of the residuals was s = 0.26. Explain what that means in context.
A doctor claims that the mean number of hours of sleep that seniors in high school get per night differs from the mean number of hours of sleep college seniors get per night. To investigate, he selects a random sample of 50 high school seniors from all high schools in his county. He also selects a random sample of 50 seniors from the colleges in his county. He constructs a 95% confidence interval for the true mean difference in the number of hours of sleep for seniors in high school and seniors in college. The resulting interval is (0.57, 1.25). Based upon the interval, can the doctor conclude that mean number of hours of sleep that seniors in high school get per night differs from the mean number of hours of sleep college seniors get per night? yes because 1 is in the confidence interval yes because 0 is not in the confidence interval no because 1 is in the confidence interval no because 0 is not in the confidence interval
According to the document Consumer Expenditures, the average consumer spent $1,874 on apparel and services in 2006. That same year, a sample of 25 consumers in the Northeast had a sample mean and standard deviation of $2,061 and $351, respectively. We are to conduct a hypotheses test to determine whether the 2006 mean annual expenditure on apparel and services for consumers in the Northeast differed from the national mean of $1,874. a. Test statistic isb. The ? − value of the test isc. At the significance level calculated in part b), we conclude that the mean annual expenditure on apparel and services for consumers in the Northeast is
In a time-use study, twenty randomly selected managers spend a mean of 2.4 hours each day on paperwork. The standard deviation of the twenty scores is 1.3 hours. Construct the 95% confidence interval for the mean paperwork time of all managers.
The Robotics Manufacturing Company operates an equipment repair business where emergency jobs arrive randomly at the rate of two jobs per 8-hour day. The company's repair facility is a single - server system operated by a repair technician. The service time varies, with a mean repair time of 3.2 hours and a standard deviation of 2.0 hours. The company's cost of the repair operation is $27 per hour. In the economic analysis of the waiting line system, Robotics uses $37 per hour cost for customers waiting during the repair process. (a) What are the arrival rate and service rate in jobs per hour? (Round your answers to four decimal places.) Show the operating characteristics. (Round your answers to four decimal places. Report time in hours.) Show the total cost per hour. (Express the total cost per hour in dollars. Round your answer to the nearest cent.) The company is considering purchasing a computer-based equipment repair system that would enable a constant repair time of 3.2 hours.…
Insurance Company A claims that its customers pay less for car insurance, on average, than customers of its competitor, Company B. You wonder if this is true, so you decide to compare the average monthly costs of similar insurance policies from the two companies. For a random sample of 13 people who buy insurance from Company A, the mean cost is $⁢150 per month with a standard deviation of $⁢19. For 9 randomly selected customers of Company B, you find that they pay a mean of $⁢157 per month with a standard deviation of $16. Assume that both populations are approximately normal and that the population variances are equal to test Company A’s claim at the 0.05 level of significance. Let customers of Company A be Population 1 and let customers of Company B be Population 2. Step 2 of 3: Compute the value of the test statistic. Round your answer to three decimal places. Step 3 of 3: Draw a conclusion and interpret the decision.
Insurance Company A claims that its customers pay less for car insurance, on average than customers of its competitor, Company B. You wonder if this is true, so you decide to compare the average monthly costs of similar insurance policies from the two companies. For a random sample of 11 people who buy insurance from Company A, the mean cost is $⁢150 per month with a standard deviation of $⁢14. For 14 randomly selected customers of Company B, you find that they pay a mean of $⁢158 per month with a standard deviation of $⁢12. Assume that both populations are approximately normal and that the population variances are equal to test Company A’s claim at the 0.10 level of significance. Let customers of Company A be Population 1 and let customers of Company B be Population 2. Step 2 of 3 : Compute the value of the test statistic. Round your answer to three decimal places.
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In a survey, 29 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $35 and standard deviation of $9. Find the margin of error at a 80% confidence level.
In a survey, 23 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $31 and standard deviation of $8. Find the margin of error at a 95% confidence level.
a. 14.0, 16.3, 18.7, 19.9, 21.3 b. 16.1, 13.4, 13.6, 14.9, 14.1, 10.5 Construct the 95% confidence interval for the difference in u of the two given samples.
According to the College Board, scores on the math section of the SAT Reasoning college entrance test for the class of 2010 had a mean of 516 and a standard deviation of 116. Assume that they are roughly normal.One of the quartiles of the scores from the math section of the SAT Reasoning test is 438. The other quartile is _______.

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College tuition: A simple random sample of 35 Colleges and universities in the united states had a mean tuition of $18,702 with a standard deviation of $10, 653. Construct a 95% Confidence interval for the mean tuition for all Colleges and Universities in the united states.