Question 7 A group of scientists went to two separate music festivals: a rock music festival and an EDM festival. The scientists observed 21 rock bands and 24 EDM artists. To determine if EDM concerts are louder than rock concerts, the decibel level of each artist was measured and recorded. The summary statistics and l-mown variances are recorded in the following table: m Poulation Variance m 126.5 _Ei_ Note: The higher the decibel level is, the louder it is. a) Is there any evidence to suggest EDM concerts are louder than rock concerts? Be sure to state your null and alternative hypothesis. Assume normality and use a = 0.05. {I mark) b) Find the p-value associated with this hypothesis test. ( 1 mark)