Many junior high school students drink colas on a daily basis. A researcher is interested in testing the effects of cola ingestion on academic performance (AP) for girls in the ninth grade. One thousand ninth-grade girls are the subjects. They are grouped according to the number of colas they drink each day (low, medium, and high). The researcher concluded that cola ingestion had an effect on academic performance. What did the researchers do with the null hypothesis?
A) Rejected it
B) Determined it was still tenable
C) Impossible to determine without knowing the α level

Question

Quizplus · Accepted Answer

The researcher rejected the null hypothesis, which is typically the default assumption that there is no relationship or effect between the variables being studied. By rejecting the null hypothesis, the researcher concluded that there is a significant relationship between cola ingestion and academic performance for ninth-grade girls.

Many Junior High School Students Drink Colas on a Daily