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.