You want to test whether a blood pressure medication actually works.You give it to a group of n = 30 patients.You get another group of n=25 patients and give them a placebo.You want to compare the two groups to see whether they have a mean difference in blood pressure.What kind of hypothesis test should you do?

Group of answer choices

Related-Samples t-test

One-Sample z-test

One-Sample t-test

Independent-Samples t-test

You want to see if violent videos games have any effect on aggression for middle school boys.So, you get a sample of 30 middle school boys.You have them play a violent video game, then watch them on the playground for one hour to measure how many punches, kicks, or shoves they do to other children.You get another sample of n=35 middle schools boys, and repeat the procedure but this time with a nonviolent video game.You want to compare the two groups of boys to see if they showed a mean difference on aggression.What kind of hypothesis test do you think would be appropriate for this study?

Group of answer choices

One-Sample t-test

Independent-Samples t-test

Related-Samples t-test

One-Sample z-test

You want to study whether music affects people's ability to learn.You get a sample of college students.First, you have them study a list of words with soft classical music playing, then you test how many words they correctly remember.Second, you have them study a list of words with loud heavy metal playing, then you test how many words they correctly remember.You want to compare their learning/memory with the classical music to their learning/memory with the loud heavy metal music.What kind of hypothesis test should you do?

Group of answer choices

One-Sample z-test

One-Sample t-test

Related-Samples t-test

Independent-Samples t-test