Question

1. There are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. The first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%.
The line plot shows the differences after 10 rerandomizations. Determine whether the difference in the means of the two groups is significant based on the line plot. Explain your answer.

Answer 1

@agent0smith

Answer 2

Do you have any idea how to tell if it's significant or not?

Answer 3

The more points on the graph, the more likely it is to happen.

Answer 4

For it to be significant means it needs to be unlikely.

Answer 5

"first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%"
from this you can see the difference in those means, and then locate that value on the graph.

If it's in a spot near the centre of the spread, then it's likely to happen by chance. If it's far from the centre, then it is a significant difference.

Answer 6

@agent0smith so...the 95% and 92% mean points is located in points 3 and 4?

Answer 7

You want the *difference* between them. What's the difference between 92% and 95%?

Answer 8

@agent0smith I got 0.03 which as a percent it is 3%

Answer 9

...the difference is 3. Now go back and read what I said about how to tell if it's likely or unlikely.

Answer 10

well all I know is that If it's far from the centre, then it is a significant difference. @agent0smith

Answer 11

Look at the graph you were given. Tell me where the center is.