Question 9 A finance officer for a large company wants to find out an estimate for the percentage of company accounts whose payments are more than 30 days overdue. He carries out a survey by randomly selecting a sample of accounts. The results are shown in the table below. Number of days overdue Less than 10 days Between 10 and 30 days More than 30 days Number of accounts 80 28 42 a) Use the information in the table above to find the percentage of accounts in the sample that are more than 30 days overdue. b) Using your answer to part a), find the 90% confidence interval for the percentage of all the accounts in the company that are more than 30 days overdue. Give your answers to the nearest integer. c) The finance officer wants the total width of the 90% confidence interval in part b) to be less than 8%. Work out the smallest sample size that should be taken to achieve this.

Question 9 A finance officer for a large company wants to find out an estimate for the percentage of company accounts whose payments are more than 30 days overdue. He carries out a survey by randomly selecting a sample of accounts. The results are shown in the table below. Number of days overdue Less than 10 days Between 10 and 30 days More than 30 days Number of accounts 80 28 42 a) Use the information in the table above to find the percentage of accounts in the sample that are more than 30 days overdue. b) Using your answer to part a), find the 90% confidence interval for the percentage of all the accounts in the company that are more than 30 days overdue. Give your answers to the nearest integer. c) The finance officer wants the total width of the 90% confidence interval in part b) to be less than 8%. Work out the smallest sample size that should be taken to achieve this.

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Description: Question 9A finance officer for a large company wants to find out an estimate for the percentage ofcompany accounts whose payments are more than 30 days overdue. He carries out asurvey by randomly selecting a sample of accounts. The results are show

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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Concept explainers

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.

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