Answered: To avoid any rounding off error, please…

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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To avoid any rounding off error, please compute at 2 more digits before rounding off.

Assume that number of cases of COVID-19 per day in a city are normally distributed. A sample of 36 days revealed the average number of Cases to be 140 with a population standard deviation of 51.

(a) What is the critical value that will need to be used to calculate a 90% confidence interval?

Round your answers for part (c) to the nearest whole number.

(b) What is the 90% confidence interval for the number of COVID-19 cases per day:

( )<μ< ( )

Round your answer for part (d) UP to the nearest whole number.

(c) With a 99% confidence level, determine the minimum sample size (number of days) required if the precision of the estimation is to be within ±±18 (the standard deviation remains the same).

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