| 
  • If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!

View
 

Statprob3

Page history last edited by PBworks 18 years, 2 months ago

Problem 3 of 3

 

It is found that 40% of all students returning to school in September catch a common cold, while the rest do not. From among the students in the school 600 are randomly selected.

 

(a) Determine the mean and population standard deviation for the students who catch a cold.

 

(b) What is the 90% confidence interval for the mean number of students who will catch a cold in this group. Explain the meaning of your confidence interval.

 

Solution

 

(a)

n=600 - for the number of students

p=.40 - for the percentage of students who catch a cold

q=.60 - for the number of students who doesn't catch a cold

M=np=(600)(.40)=240 - the mean

S=√9600)(.40)(.60)=144 - the standard deviation

 

 

Previous Problem

Home

Next Unit

Comments (0)

You don't have permission to comment on this page.