One sample t test results

P value and statistical significance:

The two-tailed P value equals 0.00000022

By conventional criteria, this difference is considered to be extremely statistically significant.

Confidence interval:

The hypothetical mean is 75.0000

The actual mean is 63.0000

The difference between these two values is −12.0000

The 95% confidence interval of this difference:

From −14.3463 to −9.6537

Intermediate values used in calculations:

t = −11.2570

df = 11

standard error of difference = 1.066