A group of scientists is conducting an experiment on the effects of media on children. They randomly select 100 children and randomly assign each child to one of four treatment groups. Each treatment group has a specific amount of screen time during a one-week time frame. The first group has no screen time, the second group has two hours of screen time, the third group has four hours of screen time, and the fourth group has six hours of screen time.After the first week, the scientists conduct the same experiment, with the same subject groups, for three more weeks so that each group experiences each of the four treatments.Which statements about this study are true? This study uses blocking. This study uses blinding. This study uses random sampling. This study uses a repeated measures design. This study uses a control group.

Suppose we decide to conduct an experiment with your statistics class. Our dependent variable is student absences, and our intervention is that after the 5th week, the instructor starts taking attendance publicly by calling out the name of each student. We measure attendance every week and see the trend before and after the intervention. What kind of experiment design is this?Group of answer choicesrandomisedTime seriesboth

In an experiment, the group that receives the treatment the researchers want to study is known as the _____ group.Multiple choice question.experimentalcontrolplaceboquasi-experimental

A study was conducted to explore the possibility of a podcast treatment effect on someone's ability to estimate time. One version of the study involved 95 school students. Each student was led into a dark room, and asked to press a button exactly three minutes after a signal was given. The time that actually passed from the signal to the pushing of the button was recorded in seconds. The school students were allocated to a group randomly at the time that they signed up for the study. One group listened to a podcast during the study, while the other group did not. The researchers found a difference of 8.7 seconds between the mean of the times recorded for each group, with the group that listened to a podcast having the higher mean. The tail proportion from a randomisation test carried out with the data from the study was 109/1000. Is the observed difference unusual when compared to the 'just chance' distribution? (enter yes or no)

A researcher is interested in whether watching an educational program on television has a positive impact on children's grades at school. The researcher records the number of days children watch an educational program over a one-month period and relates it to their grades at school. This study is best described as:Question 13Answera.quasi-experimental.b.correlational.c.experimental.d.a survey.

Which of the following best describes a research study that randomly assigns people to different conditions and carefully controls all the other circumstances so that they will be equivalent across the two conditions?experimentcorrelationsurveyobservation