A cognitive psychologist is comparing ADHD children to a sample of non-ADHD controls using an established measure of reaction time that captures attention span. The mean difference is 150 (the ADHD group mean is higher by 150 points), with a confidence interval for the mean difference ranging between 25 and 350. Which of the following population parameters are not supported by the data? That is, if the following values were used as the null hypothesis, which value(s) would the data refute? CHECK ALL THAT APPLY. Select one or more:
a. 500
b. 50
c. -23
d. 0
e. None of the above