41 people with dementia, the mean age at diagnosis was 52.1 years with a standard deviation of s = 6.4 years.?

Update: a)Find a 90% confidence interval for μ the mean age at diagnosis of people with early-onset dementia. Use two decimal places in your margin of error.
b) Interpret of your interval in the context of this situation.
Update 2: a)Find a 90% confidence interval for μ the mean age at diagnosis of people with early-onset dementia. Use two decimal places in your margin of error. b) Interpret of your interval in the context of this situation C)How large a sample would be needed to estimate the mean age at diagnosis of people with... show more a)Find a 90% confidence interval for μ the mean age at diagnosis of people with early-onset dementia. Use two decimal places in your margin of error.
b) Interpret of your interval in the context of this situation
C)How large a sample would be needed to estimate the mean age at diagnosis of people
with early-onset dementia μ so that the margin of error of 2 with 90% confidence?
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