Z-statistic = (sample mean - population mean)/(standard deviation/square root of sample size)
sample mean = 105
population mean = 100
standard deviation = 15
sample size = 75
I'll let you take it from here to calculate.
Want to find if students who are musicians have higher Iq test scores than the general population. the researcher predicts that playing music is associated with higher IQ scores. the researcher selects a sample of 75 musicians from area and gives them an IQ test. The mean for the sample is 105. The mean for the general population is 100 with a standard deviation of 15. What is Z obt for this sample?
1 answer