A Researcher Is Interested in Whether Students Who Are Musicians

Multiple Choice

A researcher is interested in whether students who are musicians have higher intelligence test scores than students in the general population. The researcher predicts that playing a musical instrument is associated with higher intelligence test scores. The researcher selects a sample of 75 musicians from local high schools and gives them an intelligence test. She compares their average intelligence to that of students in the general population and finds that z_obt = +1.92. This is a _____ test and the researcher should conclude _____.​

A) one-tailed; that students who are musicians score significantly higher on intelligence tests
B) two-tailed; that students who are musicians score significantly higher on intelligence tests
C) one-tailed; that students who are musicians do not score significantly higher on intelligence tests
D) two-tailed; that students who are musicians do not score significantly higher on intelligence tests