Calculating sums of squares, variance, standard deviation, standard error and 95% confidence interval

Question 

The time taken for 21 heavy smokers to fall off a treadmill at the fastest setting is (18, 16, 18, 24, 23, 22, 22, 23, 26, 29, 32, 34, 34,
36, 36, 43, 42, 49, 46, 46, 57) minutes.

Calculate the:

  • sums of squares,
  • variance,
  • standard deviation,
  • standard error and
  • 95% confidence interval of these data.
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