A psychologist wanted to study the effect of television violence on concentration of a particular blood chemical. The psychologist measured the chemical in 40 participants before and after the participants watched a violent show. He reported, "There was a significant decline in blood concentration from a mean of 13.41 (SD = 2.48) to 12.38 (SD = 2.69), t (39) = 3.38, p < .01 (one-tailed)." Mention the statistical test, sample size, critical value, and standard error.
1. Statistical test: Dependent samples t-test.
2. Sample size: 40.
3. Critical value: 3.38.
4. Standard error: 0.82.
A psychologist wanted to study the effect of television violence on concentration of a particular blood...
4. A researcher studied the effect of television violence on concentration of a particular blood chemical. In this study, 40 participants were measured over a period of an hour prior to watching a violent show and then immediately after. In the results section, the researcher writes: "There was a significant decline in blood concentration from a mean of 13.41 (SD = 2.48) to 12.38 (SD = 2.69), t(39) = 3.38, p < .01 (one tailed)." Explain this result (including the...