Work showing how to solve for E and Z in the following 2 problems

User Generated

Pbfzvp13

Mathematics

Description

Work showing/explaining how do you solve for E and Z (circled on the following two problems) dealing with confidence intervals. I need help please.

Unformatted Attachment Preview

User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

Hi,I have given all the steps using T1 84 calculator and the formula that uses to calculate.Let me know if you have any doubt.Thank you.

Last Name 1
Name
University Name
Course
Dec 18, 2017
Q1.
Given X-bar = 4150 pounds (average weight)
Sample size =40
Standard deviation =480 pounds
Z= critical z-value
The formula for finding the confidence interval is given by
Confidence Interval ,CI = Mean ± Z*Standard error
Standard error = Standard deviation/square root(sample size) = 480/sqrt(40) = 75.89
Now,Mean = 4150
Critical z-value using t1-84 calculator...


Anonymous
This is great! Exactly what I wanted.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Related Tags