Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
1st Edition
ISBN: 9780078682278
Author: McGraw-Hill, Berchie Holliday
Publisher: Glencoe/McGraw-Hill
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Chapter 14.5, Problem 9CFU

a.

To determine

Find the standard error of the mean.

a.

Expert Solution
Check Mark

Answer to Problem 9CFU

  0.28

Explanation of Solution

Given information:

An aptitude test was taken by an employment agency. 150 clients were randomly selected and the time to complete the test of each client was calculated. The average time was 27.5mins with the standard deviation 3.5mins .

Calculation:

Here, we have to find the standard error of the mean:

  σX¯=Standard deviationNσX¯=3.5150=0.28

Hence, the standard error is 0.28 .

b.

To determine

Find the interval about the sample mean with 50% chance of having true mean within the interval.

b.

Expert Solution
Check Mark

Answer to Problem 9CFU

  [27.30,27.70]

Explanation of Solution

Given information:

An aptitude test was taken by an employment agency. 150 clients were randomly selected and the time to complete the test of each client was calculated. The average time was 27.5mins with the standard deviation 3.5mins .

Calculation:

Here, we will find the interval:

  P=50%correspondstot=0.7Interval:[X¯tσX¯,X¯+tσX¯][27.30,27.70]

Hence, the required answer is [27.30,27.70] .

c.

To determine

Find the interval about the sample mean having 1% confidence level.

c.

Expert Solution
Check Mark

Answer to Problem 9CFU

  [27.75,28.24]

Explanation of Solution

Given information:

An aptitude test was taken by an employment agency. 150 clients were randomly selected and the time to complete the test of each client was calculated. The average time was 27.5mins with the standard deviation 3.5mins .

Calculation:

Here, 1% confidence level means when P=99% .

  P=99%correspondstot=2.58interval:[X¯tσX,X¯+tσX][27.75,28.24]

Hence, the required answer is [27.75,28.24] .

Chapter 14 Solutions

Advanced Mathematical Concepts: Precalculus with Applications, Student Edition

Ch. 14.1 - Prob. 11ECh. 14.1 - Prob. 12ECh. 14.1 - Prob. 13ECh. 14.1 - Prob. 14ECh. 14.1 - Prob. 15ECh. 14.1 - Prob. 16ECh. 14.1 - Prob. 17ECh. 14.1 - Prob. 18ECh. 14.1 - Prob. 19ECh. 14.1 - Prob. 20ECh. 14.1 - Prob. 21ECh. 14.1 - Prob. 22ECh. 14.2 - Prob. 1CFUCh. 14.2 - Prob. 2CFUCh. 14.2 - Prob. 3CFUCh. 14.2 - Prob. 4CFUCh. 14.2 - Prob. 5CFUCh. 14.2 - Prob. 6CFUCh. 14.2 - Prob. 7CFUCh. 14.2 - Prob. 8CFUCh. 14.2 - Prob. 9CFUCh. 14.2 - Prob. 10ECh. 14.2 - Prob. 11ECh. 14.2 - Prob. 12ECh. 14.2 - Prob. 13ECh. 14.2 - Prob. 14ECh. 14.2 - Prob. 15ECh. 14.2 - Prob. 16ECh. 14.2 - Prob. 17ECh. 14.2 - Prob. 18ECh. 14.2 - Prob. 19ECh. 14.2 - Prob. 20ECh. 14.2 - Prob. 21ECh. 14.2 - Prob. 22ECh. 14.2 - Prob. 23ECh. 14.2 - Prob. 24ECh. 14.2 - Prob. 25ECh. 14.2 - Prob. 26ECh. 14.2 - Prob. 27ECh. 14.2 - Prob. 28ECh. 14.2 - Prob. 29ECh. 14.2 - Prob. 30ECh. 14.2 - Prob. 31ECh. 14.2 - Prob. 32ECh. 14.2 - Prob. 33ECh. 14.2 - Prob. 34ECh. 14.2 - Prob. 35ECh. 14.2 - Prob. 36ECh. 14.2 - Prob. 37ECh. 14.2 - Prob. 38ECh. 14.2 - Prob. 39ECh. 14.3 - Prob. 1CFUCh. 14.3 - Prob. 2CFUCh. 14.3 - Prob. 3CFUCh. 14.3 - Prob. 4CFUCh. 14.3 - Prob. 5CFUCh. 14.3 - Prob. 6CFUCh. 14.3 - Prob. 7CFUCh. 14.3 - Prob. 8CFUCh. 14.3 - Prob. 9ECh. 14.3 - Prob. 10ECh. 14.3 - Prob. 11ECh. 14.3 - Prob. 12ECh. 14.3 - Prob. 13ECh. 14.3 - Prob. 14ECh. 14.3 - Prob. 15ECh. 14.3 - Prob. 16ECh. 14.3 - Prob. 17ECh. 14.3 - Prob. 18ECh. 14.3 - Prob. 19ECh. 14.3 - Prob. 20ECh. 14.3 - Prob. 21ECh. 14.3 - Prob. 22ECh. 14.3 - Prob. 23ECh. 14.3 - Prob. 24ECh. 14.3 - Prob. 25ECh. 14.3 - Prob. 26ECh. 14.3 - Prob. 27ECh. 14.3 - Prob. 28ECh. 14.3 - Prob. 29ECh. 14.3 - Prob. 30ECh. 14.3 - Prob. 31ECh. 14.3 - Prob. 32ECh. 14.3 - Prob. 1MCQCh. 14.3 - Prob. 2MCQCh. 14.3 - Prob. 3MCQCh. 14.3 - Prob. 4MCQCh. 14.3 - Prob. 5MCQCh. 14.3 - Prob. 6MCQCh. 14.3 - Prob. 7MCQCh. 14.3 - Prob. 8MCQCh. 14.3 - Prob. 9MCQCh. 14.3 - Prob. 10MCQCh. 14.4 - Prob. 1CFUCh. 14.4 - Prob. 2CFUCh. 14.4 - Prob. 3CFUCh. 14.4 - Prob. 4CFUCh. 14.4 - Prob. 5CFUCh. 14.4 - Prob. 6CFUCh. 14.4 - Prob. 7CFUCh. 14.4 - Prob. 8CFUCh. 14.4 - Prob. 9ECh. 14.4 - Prob. 10ECh. 14.4 - Prob. 11ECh. 14.4 - Prob. 12ECh. 14.4 - Prob. 13ECh. 14.4 - Prob. 14ECh. 14.4 - Prob. 15ECh. 14.4 - Prob. 16ECh. 14.4 - Prob. 17ECh. 14.4 - Prob. 18ECh. 14.4 - Prob. 19ECh. 14.4 - Prob. 20ECh. 14.4 - Prob. 21ECh. 14.4 - Prob. 22ECh. 14.4 - Prob. 23ECh. 14.4 - Prob. 24ECh. 14.4 - Prob. 25ECh. 14.4 - Prob. 26ECh. 14.4B - Prob. 1GCECh. 14.4B - Prob. 2GCECh. 14.4B - Prob. 3GCECh. 14.4B - Prob. 4GCECh. 14.4B - Prob. 5GCECh. 14.4B - Prob. 6GCECh. 14.4B - Prob. 7GCECh. 14.4B - Prob. 8GCECh. 14.5 - Prob. 1CFUCh. 14.5 - Prob. 2CFUCh. 14.5 - Prob. 3CFUCh. 14.5 - Prob. 4CFUCh. 14.5 - Prob. 5CFUCh. 14.5 - Prob. 6CFUCh. 14.5 - Prob. 7CFUCh. 14.5 - Prob. 8CFUCh. 14.5 - Prob. 9CFUCh. 14.5 - Prob. 10CFUCh. 14.5 - Prob. 11ECh. 14.5 - Prob. 12ECh. 14.5 - Prob. 13ECh. 14.5 - Prob. 14ECh. 14.5 - Prob. 15ECh. 14.5 - Prob. 16ECh. 14.5 - Prob. 17ECh. 14.5 - Prob. 18ECh. 14.5 - Prob. 19ECh. 14.5 - Prob. 20ECh. 14.5 - Prob. 21ECh. 14.5 - Prob. 22ECh. 14.5 - Prob. 23ECh. 14.5 - Prob. 24ECh. 14.5 - Prob. 25ECh. 14.5 - Prob. 26ECh. 14.5 - Prob. 27ECh. 14.5 - Prob. 28ECh. 14.5 - Prob. 29ECh. 14.5 - Prob. 30ECh. 14.5 - Prob. 31ECh. 14.5 - Prob. 32ECh. 14.5 - Prob. 33ECh. 14.5 - Prob. 34ECh. 14.5 - Prob. 35ECh. 14.5 - Prob. 36ECh. 14.5 - Prob. 37ECh. 14.5 - Prob. 38ECh. 14.5 - Prob. 39ECh. 14 - Prob. 1SGACh. 14 - Prob. 2SGACh. 14 - Prob. 3SGACh. 14 - Prob. 4SGACh. 14 - Prob. 5SGACh. 14 - Prob. 6SGACh. 14 - Prob. 7SGACh. 14 - Prob. 8SGACh. 14 - Prob. 9SGACh. 14 - Prob. 10SGACh. 14 - Prob. 11SGACh. 14 - Prob. 12SGACh. 14 - Prob. 13SGACh. 14 - Prob. 14SGACh. 14 - Prob. 15SGACh. 14 - Prob. 16SGACh. 14 - Prob. 17SGACh. 14 - Prob. 18SGACh. 14 - Prob. 19SGACh. 14 - Prob. 20SGACh. 14 - Prob. 21SGACh. 14 - Prob. 22SGACh. 14 - Prob. 23SGACh. 14 - Prob. 24SGACh. 14 - Prob. 25SGACh. 14 - Prob. 26SGACh. 14 - Prob. 27SGACh. 14 - Prob. 28SGACh. 14 - Prob. 29SGACh. 14 - Prob. 30SGACh. 14 - Prob. 31SGACh. 14 - Prob. 32SGACh. 14 - Prob. 33SGACh. 14 - Prob. 34SGACh. 14 - Prob. 35SGACh. 14 - Prob. 36SGACh. 14 - Prob. 37SGACh. 14 - Prob. 38SGACh. 14 - Prob. 39SGACh. 14 - Prob. 40SGACh. 14 - Prob. 41SGACh. 14 - Prob. 42SGACh. 14 - Prob. 1SAPCh. 14 - Prob. 2SAPCh. 14 - Prob. 3SAPCh. 14 - Prob. 4SAPCh. 14 - Prob. 5SAPCh. 14 - Prob. 6SAPCh. 14 - Prob. 7SAPCh. 14 - Prob. 8SAPCh. 14 - Prob. 9SAPCh. 14 - Prob. 10SAP
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