The average GRE score for math in a sample of students is 490. When you create a 95% confidence interval around this average, the lower limit is 260. What is the upper limit for this 95% confidence interval?

95% = 490 ± (490-260)

To find the upper limit of a 95% confidence interval, we need to know the margin of error. The margin of error represents the range within which the true population parameter is likely to fall.

In this case, the lower limit of the confidence interval is 260, and we know that the average GRE score for math in the sample is 490. To find the margin of error, we subtract the lower limit from the average:

Margin of error = Average - Lower limit
= 490 - 260
= 230

Since the confidence interval is symmetric, the upper limit can be found by adding the margin of error to the average:

Upper limit = Average + Margin of error
= 490 + 230
= 720

Therefore, the upper limit for this 95% confidence interval is 720.