A study compared mean salivary flow rate in people with cerebral palsy and people in a control group. Each group had 10 people.
Here are some descriptive R statistics of the salivary flow rate for each group.
> summary(CerebralPalsy)
Min. 1st Qu. Median Mean 3rd Qu. Max.
-0.05226 0.03594 0.17770 0.14710 0.20640 0.38410
> sd(CerebralPalsy)
[1] 0.1424913
> summary(Control)
Min. 1st Qu. Median Mean 3rd Qu. Max.
0.0112 0.1404 0.2711 0.3593 0.5558 0.8156
> sd(Control)
[1] 0.2819059
a) Do we have significant evidence at α = 5% that the mean salivary flow rate are different between these groups?