Need help setting this one up re hypothesis and what test to

Need help setting this one up re: hypothesis and what test to run. Then I can run in R. Thanks.

Clinical observations suggest that specifically language-impared (SLI) children have great difficulty with the proper use of pronouns. Thirty children participated in the study that investigated this phenomenon. Ten were three-year-old SLI children, 10 were three-year-old normal developing children (YND), and 10 were five-year-old normal developing children (OND). Conduct a hypothesis test to see if the error rates for the SLI and YND groups. Use =0.05. Remember to state and check any assumptions, decide on a test, and clearly state the hypotheses and your findings.

pronouns<-read.csv(\"pronouns.csv\")

YND<-pronouns[pronouns$Group==\"YND\",]

SLI<-pronouns[pronouns$Group==\"SLI\",]

Solution

H0: the error rates among the three groups are the same

H!: the error rate is different for atleast one group

We use ANOVA test here to investigate the above hypothesis.