Hallam, price, and katsarou (2002) investigated the influence of background noise on classroom performance for children aged 10 to 12. in one part of the study, calming music led to better performance performance on an arithmetic task compared to a no-music condition. suppose that a researcher selects a class of 18 students who listen to calming music each day while working on arithmetic problems. a second class of 18 serves as a control group with no music. accuracy scores on the arithmetic problems are measured for each child. what test should you use to determine whether there is a significant difference in average accuracy scores between the two conditions.
a) make a point estimate of the population mean difference is accuracy performance for music versus no music in the classroom. b) compute the 90% confidence interval for the population mean difference.