a) A college principal decides to consult the students about a proposed change in the time of lectures. She finds that out of a random sample of 80 students, 57 are in favour of the change. i. Calculate a 95 % confidence interval for the proportion of students who are not in favour of the change. ii. State the effect on the width of such a confidence larval when the confidence level is increased.
a) A college principal decides to consult the students about a proposed change in the time of lectures. She finds that out of a random sample of 80 students, 57 are in favour of the change. i. Calculate a 95 % confidence interval for the proportion of students who are not in favour of the change. ii. State the effect on the width of such a confidence larval when the confidence level is increased.
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) A college principal decides to consult the students about a proposed change in the time of lectures. She finds that out of a random sample of 80 students, 57 are in favour of the change.
i. Calculate a 95 % confidence interval for the proportion of students who are not in favour of the change.
ii. State the effect on the width of such a confidence larval when the confidence level is increased.
b) A random variable of 7 independent observations of a normal variable gave ∑ ? = 35. 9 ∑ ? 2 = 186.19 Calculate i. The sample mean
ii. The sample variance iii. A 90% confidence interval for the population mean
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