Question

A recent study reported that volunteers randomly assigned to play a video game called Portal 2" for eight hours performed significantly better on a problem solving test than those who played a brain-training game called Lumosity." What does the phrase significantly better" imply? Select all that apply.

It means the distance between the test scores for the two groups is an important difference in problem solving skill.

It means the average test score for the Portal 2 group is substantially larger than for the Lumosity group.

It means the observed difference in test scores was unlikely to occur by chance.

It means a p-value for testing whether the average test scores are different is less than the significance level. It means every volunteer who played Portal 2 performed better on the test than every volunteer who played Lumosity.

Answer 1

Answer -

It means the average test score for the Portal 2 group is substantially larger than for the Lumosity group.