For which of the following situations is the dependent groups t-test (paired t-test) appropriate? The IV is Time (Baseline and one-month post intervention); the DV is blood pressure The IV is time since incarceration (1 month vs. 3 months vs. 6 months); the DV is body weight The IV is age group (teenagers vs. young adults); the DV is attitudes toward condom use The IV is nap therapy for narcoleptics (before vs. after treatment); the DV is unplanned naps the following week (had vs. did not have an unplanned nap)