Task 4: In Chapter 1 we used an example of the time taken for 21 heavy smokers

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Task 4: In Chapter 1 we used an example of the time taken for 21 heavy smokers to fall off a treadmill at the fastest setting (18, 16, 18, 24, 23, 22, 22, 23, 26, 29, 32, 34, 34, 36, 36, 43, 42, 49, 46, 46, 57). Calculate the standard error and 95% confidence interval of these data.

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