1. Which of the following situations is most likely to use repeated measures design?
   1. Comparing the number of items recalled after showing one group slides with nouns and another separate group slide with pictures.
   2. Comparing the levels of Lead in the blood in a sample of children living near a smelter and in another sample of children (n = 10) living in an unpolluted area (n=7).
   3. Comparing the number of items in stock before a television ad is aired and the number of items in stock after the television ad is aired.
   4. Looking at the stress levels of participants who participated in weight-lifting training compared to participants who participated in cardio training.