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Here we were comparing the population mean of blood concentration before and after watching a violent show. We measured the blood concentration of same participants before watching a violent show and after watching a violent show. This type of design is known as paired design because the same measurement was taken on the same observation before and after some activity. We can use paired sample t test if the data is obtained before and after the treatment. In this case, a paired sample t test was used to test whether there is any significant decrease in mean blood concentration before and after watching a violent show on television. We can conclude that there is a significant decline in mean blood concentration after watching a violent show on television. Here we are comparing two sample means for independent groups. Independent sample t test was used when we are comparing the means of two independent samples. The below are the null and alternative hypotheses for above question Null Hypothesis (Ho) There is no significant difference in the population mean self-disclosed between sitting in an easy chair and lying down on a couch. Alternative Hypothesis (Ha) There is a significant difference in the