We can infer a statistically significant difference between two population means when: a. our estimates of the two means are different. b. the variances of the two means do not overlap. c. the...

We
can infer a statistically significant difference between two population means
when:
a. our
estimates of the two means are different.
b. the
variances of the two means do not overlap.
c. the
standard deviations of the two means do not overlap.
d. the
95% confidence intervals for the two means do not overlap.
e. the
95% confidence intervals for the two means are of different widths.