Is evidence sufficient the mean age at diagnosis of people with dementia is different from 55 years old?

Update: Conduct a hypothesis test at the 0.01 significance level to test this.

a) State the null hypotheses H0.

b) State the alternative hypotheses Ha.

c) What is the value of the one-sample t statistic?

d) Find the p-value using Statkey.

e) Can we reject H0 at significance level 0.01?
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