Question

A research study was conducted to determine if children with attention deficit/hyperactivity disorder, ADHD, have smaller brains than children without the condition. She computed a z score of -1.73.

Using a left tailed test of hypothesis, find the p-value, and at a 5% confidence level, determine if the data provides evidence that children with ADHD have smaller brains than the children without the condition.

Be sure to properly define x, draw and label the bell curve, and write out a complete sentence stating the conclusion at the end.

Answer 1

As Givena Left tailed testi- Z=-1.73 2=0.05 P-value=P (ZcZtest) =P(2<-1-73) (using Z-table) P-value = 0.0418 Pavadue La Since Paraque less than significance level (2) so we Reject Ho Conclusion :- There is sufficient evidence to Claim that childden with ADHD have smaller brains than the childden without the condition. Left tailed test P-value = 0.0418 Rejection Region -1.73- Ztest