A marketing director developed a short television commercial to improve the image of a company.  The commercial was tested on 20 people.  People’s attitudes about the company were measured with a questionnaire when they first came in for the experiment and then again with the same questionnaire after viewing the commercial.  Which statistical test would be best to determine if there is a significant difference between measures?     one-sample t-test     dependent samples t-test     independent samples t-test     ANOVA

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