Amber is conducting a program evaluation of a subscription streaming-music service. As part of the evaluation, she creates a survey that is sent to former and current subscribers. One particular item states: The monthly subscription fee is reasonable. This is measured on a 7-point scale, with 1 = completely disagree and 7 = completely agree. Descriptive statistics reveal that the mean score for current subscribers is a 5.9 and the mean score for former subscribers is a 4.6. To determine if this difference is statistically significant, Amber should conduct a(n):independent-samples t-test.chi-square test of independence.single-sample t-test.ANOVA and post-hoc tests.