#### A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 212

Backtrace:

File: /home/mycocrkc/statisticsanswered.com/application/views/question.php

Line: 212

Function: _error_handler

File: /home/mycocrkc/statisticsanswered.com/application/controllers/Questions.php

Line: 416

Function: view

File: /home/mycocrkc/statisticsanswered.com/index.php

Line: 315

Function: require_once

## A random sample of 18 purchases showed the amounts in the table (in $). The mean is $50.91 and the standard deviation is $24.40

A random sample of 18 purchases showed the amounts in the table (in $). The mean is $50.91

and the standard deviation is $24.40.

a) How many degrees of freedom does the t-statistic have?

b) How many degrees of freedom would the t-statistic have if the sample size had been 2

?