A Researcher in Interested in Whether Students Who Are Musicians $\sigma$

Multiple Choice

A researcher in 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.The mean for the sample is 105.The mean for the general population (µ) is 100 with a standard deviation ( $\sigma$ ) of 15.What is z_obt for this sample?

A) .33
B) 1.89
C) 2.89
D) 3.25