Shown are the ages (in years) of the Presidents at the times of their deaths.

1. Do the data represent a population or a sample?
2. Select a random sample of 12 ages and find the variance and standard deviation,
3. Find the \(95 \%\) confidence interval of the standard deviation.
4. Find the standard deviation of all the data values.
5 . What assumption(s) must be considered for constructing the confidence interval in step 3?

Transcribed Image Text:

67 68 71 66 63 58 388 90 60 88 78 23824 8.3 85 53 65 70 72 46 23953 73 80 78 74 64 77 49 57 71 67 67 57 60 90 AXFO 79 56 71 63 64 81 9.3 93.