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Math

Statistics

If a teacher is trying to prove that new method of teaching math is more effective than traditional one, he/she will conduct a:

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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Suppose that, for budget planning purposes, the city in the previous exercise needs a better estimate of the mean daily income from parking fees. a) Someone suggests that the city use its data to create a 95% confidence interval instead of the 90% interval first created. How would this interval be better for the city? (You need not actually create the new interval.) b) How would the 95% interval be worse for the planners? c) How could they achieve an interval estimate that would better serve their planning needs?
Suppose a sample of 200 local vendors is selected as part of a survey conducted by the Ministry of Trade and it is found that 145 of the local vendors make an average income in excess of N$ 7 600 per month. a) Suppose that a 98% confidence interval estimate of the proportion of local vendors who make an average income more than N$ 7 600 per month is required. How large a sample should be taken if the desired margin of error is 8%? b) Suppose it has been established from past studies that not more than 65% of local vendors make an average income in excess of N$ 7 600 per month. Use the critical value approach and conduct a hypothesis test at a 5% level of significance to determine whether the proportion of local vendors who make an average income in excess of N$ 7 600 per month differs from the historical level.