If the 95% confi dence limits around the mean difference (in a t-test) are 10.5 – 13.0, we can conclude that, if we repeat the study 100 times, then:

(a) Our results will be statistically signifi cant 5 times

(b) Our results will be statistically signifi cant 95 times

(c) 95% of the time, the population mean difference will be between 10.5 and 13.00; 5% of the time, the population mean difference will be outside this range

(d) 5% of the time, the population mean difference will be between 10.5 and 13.00; 95% of the time, the population mean difference will be outside this range