A researcher performed an experiment with two groups. She found the difference of the means for each group. she combined the groups, chose two new groups, and found the difference between the means of those groups
repeated this process 200 times. The normal distribution of the difference in the means she found is given below
great would the difference in means between the first two groups have to be in order to considered significant?
349
3496
1.2
48
66
8.4
At least 8
At least 9
At least 10
At least 7