Identify the number of samples needed in each problem. 1. Given: d= 12 Cl= 93% O= 55 n=?
Identify the number of samples needed in each problem. 1. Given: d= 12 Cl= 93% O= 55 n=?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Estimation of parameters
Transcribed Image Text:n- (Za, ()
(2.575x(2.5)
= (6.44)2
n = 41.47
%D
n-42
Therefore, you need to select 42 textbooks as samples from the
bookstore to be 99% confident that the sample mean is within 2
years of the true population mean.
LET'S PRACTICE
Identify the number of samples needed in each problem.
1. Given: d= 12
CI= 93%
O= 55
n=?
2. Given: d 15
3. It was reported that students who do online business during this
pandemic crisis earns money with a standard deviation of P1,500. If
you wanted to estimate with 96% confidence the mean income of
students within P450 of the true population mean, how many
students should you select?
CI= 99.5%
O= 70
n=?
Solution
1. Given: d= 12
Cl= 93%o= 55
n=?
2
n= Za,
%3D
3 (8.3)²
%3D
Page | 44
Transcribed Image Text:CHAPTER 4
= 68.89 = 69
Therefore, 69 samples are needed in order to achieve a
93% confidence level.
Therefore,
96% confide
the true po
2. Given: d= 15
Cl= 99.5%
0= 70
n=?
2
n =
LE
(Zo.005/,* ()
Identify the
= (2.81x(4.67))
= (13.11)2
1. 1.
2. 2.
3. As
= 171.87 = 172 samples
st
Therefore, 172 samples are needed in order to achieve a
99.5% confidence level.
sf
3. It was reported that students who do online business during this
pandemic crisis earns money with a standard deviation of P2,000.
If you wanted to estimate with 96% confidence the mean income
of students within P450 of the true population mean, how many
students should you select?
Referer
Given: d= 450 C= 96%o= 2,000
n=?
Banigc
Schoo
n =
De G
Publis
(2000
%3D
450
Seba
= (2.05x(4.44)
= (9.1)2
Senic
= 82.81
Cerv
= 83 samples
Deli
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