Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. In the 1950s, the average score on the Child Manifest Anxiety Scale was = 15.1. A sample of n = 16 of today's children produces a mean score of M = 23.3 with SS = 240. Based on the sample, has there been as significant change in the average level of anxiety since the 1950s?

What statistical test will you use?

One-way ANOVA

z-test

One-sample t-test

Correlation

Repeated measures t-test

Regression

Independent samples t-test

Then, answer why you chose the test you did?