• 0
Votes
name

A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 192

Backtrace:

File: /home/noqkocv1izd6/public_html/application/views/question.php
Line: 192
Function: _error_handler

File: /home/noqkocv1izd6/public_html/application/controllers/Questions.php
Line: 416
Function: view

File: /home/noqkocv1izd6/public_html/index.php
Line: 315
Function: require_once

In a random sample of 20 people, the mean commute time to work was 31.4 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean u. 
What is the margin of error of u? Interpret the results.
The confidence interval for the population mean u is ( , ) (Round to one decimal place as needed.)

The margin of error for u is __. (Round to one decimal place as needed.)
Interpret the results.
A. If a large sample of people are taken approximately 80% of them will have commute times between the bounds of the confidence interval. 
B. With 80% confidence, it can be said that the commute time is between the bounds of the confidence interval.
C. With 80% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval. 
D. It can be said that 80% of people have a commute time between the bounds of the confidence interval.