The table below shows the mean number of daily errors by air traffic controller trainees during the first two weeks on the job.We want to perform a paired t-test at α = .05 to see if the mean daily errors decreased significantly. 
What would be the degrees of freedom for the appropriate test?
Definitions:
Positive Emphasis
Focusing on the positive rather than the negative aspects of a situation.
Recommendation
A suggestion or proposal as to the best course of action, especially one put forward by someone who is authoritative or knowledgeable.
Professor Verification
The process of confirming the credentials, qualifications, or status of an individual claiming to hold a professorial position.
Profile Picture
A profile picture is a digital image displayed on a social media or online profile to represent the identity or appearance of the user.
Q6: A researcher's results are shown below using
Q21: For this one-factor ANOVA (some information is
Q25: An observation with extreme values in one
Q50: A multiple choice exam has 100 questions.Each
Q59: We would use a logistic regression model<br>A)to
Q61: Using a sample of 63 observations,a dependent
Q66: A random variable is a function or
Q87: Last week,108 cars received parking violations in
Q117: In a multiple regression,all of the following
Q126: If the residuals violate the assumption of