When results show a difference between levels of a factor,this difference is called ______.

A) an interaction effect
B) a factor effect
C) a level effect
D) a main effect

A university in your region estimates that graduating average of high school students who apply for admission to a particular university program can be described by a Normal model with a mean of 82% and a standard deviation of 5%.The staff in admissions opens the applications at random looking for 10 applicants with averages above 85%.How many applications do you think the staff will need to open?

A) About 36 applications
B) About 21 applications
C) About 10 applications
D) About 28 applications
E) About 14 applications

"Does academic performance increase as social media use decreases?" is an example of a(n) ______.

A) null hypothesis
B) two-tailed hypothesis
C) closed-ended research question
D) open-ended research question

The Durbin-Watson test allows the statistics practitioner to determine whether there is evidence of first-order autocorrelation.

Is the sample mean a consistent estimator of the population mean? Explain