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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?

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