According to standard convention, a researcher must be percent sure that the difference she observed between experimental conditions was not simply the result of chance in order to conclude that the difference is statistically significant.

Answer – 95 percent

As stipulated by standard convention, a researcher must have at least a 95 percent assurance that the difference which was observed by her between experimental conditions was not merely coincidental in order to justifiably conclude that the difference she observed has statistical significance.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !