A company is researching the effectiveness of a new website design to decrease the time to access a website. Five website users were randomly selected, and their times (in seconds) to access the website with the old and new designs were recorded. To compare the times, they computed (new website design time - old website design time) . The results follow. 
For a 0.01 significance level, what is the critical value?
Definitions:
Test Statistic
A value calculated from sample data that is used in a hypothesis test to decide whether to reject the null hypothesis.
P-value
The probability of observing test results at least as extreme as the results actually observed, under the assumption that the null hypothesis is correct.
Tenure
The period or duration a person holds a particular status, position, or occupation, often used in the context of employment or property ownership.
Adjunct
An accessory, something added to another thing but not essential to it, often used in academia to describe a type of part-time instructor.
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