Grades on a standardized test are known to have a mean of 940 for students in the united states. the test is administered to 436 randomly selected students in florida; in this sample, the mean is 952.22 and the standard deviation (s) is 101.52. the 95% confidence interval for the average test score for florida students is ( nothing, nothing). (round your responses to two decimal places.) is there statistically significant evidence that florida students perform differently than other students in the united states? the 95% confidence interval for the average test score for florida students â–ľ mu = 940, so the null hypothesis that mu = 940 (that florida students have the same average performance as other students in the united states) â–ľ at the 5% level.