The final grades of studentsin BC schools are randomlyselected from various classes,namely 77, 80, 87, 84, 55, 63.Construct a 95% confidenceinterval to estimate the standarddeviation of students' scoresin BC schools. (Complete withmanual / complete process.if you use excel and similarapplications, your assignmentscore will be zero)

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Answered: The final grades of students in BC…

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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In a brake test of 4 cars driving at 30 miles per hour, it took the 55, 62, 45, and 52 feet to stop. Test the claim that the average braking speed for cars travelingat this speed is actually 58feet. Use a left tailed test of hypothesis, and the critical values method to test the claimat a 99% confidence level
It is believed that 11% of all Americans are left-handed. A college needs to know how many left-handed desks to place in the big lecture halls being constructed on its campus. In a random sample of 120 students of its 12124 students, 15 were left-handed. Does this provide enough evidence to show that students at this college have a higher percentage of left-handers than the general American population? Use a 10% level of significance.
10 engineering schools were surveyed. The first random sample of 250electrical engineers had 80 women, and the second random sample of 175chemical engineers had 40 women. Obtain an 80% confidence interval for thedifference in proportions of women in these two engineering fields
A certain college claims that less than 30% of their graduates did not find employment after one year of graduation. Based on the research conducted from a sample of 100 randomly selected graduates, 27 of them were NOT employed. Is there enough evidence to support the college's claim at 5% level of significance?
A random sample of 200 computer chips is obtained from one factory and 4% are found to be defective. Construct and interpret a 95% confidence interval for the proportion of all computer chips from that factory that are defective.
The president of a large free-standing laboratory claims that 80 percent of his 5,000 customers are satisfied with the service they receive. To test this claim, a MT research group surveyed 100 customers, using simple random sampling. Among the sampled customers, 73 percent say they are satisfied. Based on these findings, can we reject the president's hypothesis that 80% of the customers are very satisfied? Use a 0.05 level of significance.
According to a report published by the Pew Research Center in 2010, 61% of Millennials (Americans in their teens and 20’s) think their generation has a distinctive (n=527). Calculate a 99% confidence interval to estimate the percentage of Millennials who believe their generation has a distinctive identity as compared with other generations (Generation X, baby boomers, or the Silent Generation).
From an SRS of 750 16-35 year olds in the U.S.434 indicated that they felt Netflix was indispensable. Find the Margin Error for a 95% confidence
A bank randomly selected 200 checking-account customers and found that 110 of them also had savings accounts at this same bank. Construct a 95% confidence interval for the true proportion of checking-account customers who also have saving accounts at this bank.
in a random sample of 1000 homes in a certain city. it is found that 228 are heated by oil, Find the 97.5% confidence interval for the proportion of homes in this city that are heated by oil.
An ambulance service claims that at least 65% of the calls received involve life-threatening emergencies. To test on this claim, a random sample of 150 calls received was selected from the service’s records. If 87 of the calls received involved life-threatening emergencies, is the claim true at the 5% level of significance?
A bank randomly selected 249 checking account customers and found that 111 of them also had savings accounts at this same bank. Construct a 95% confidence interval for the true proportion of checking account customers who also have savings accounts.

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