Question

1. A study is carried out about the effects of smoking on sleep patterns. The results of the measurements of the times in minutes that it takes to fall asleep are summarized in the following table: Variable smoker N Mean_StDev CoefVar Minimum 01 Median 03 Maximum Time No 15 30.32 7.13 23.51 13.90 26.40 30.20 36.00 41.60 12 43.70 16.93 38.74 13.80 26.00 47.85 55.30 69.30 a to. Indicate which of these two groups of data has the highest degree of symmetry. Justify your answer p. Discuss what kind of effect smoking seems to have on the time it takes to fall asleep

Answer 1

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a. Non-smoker data has higher degree of symmetry because the mean and median coincide

b. Smoking basically increases the average time taken to fall asleep - as we can see the mean of 43.7 min is more than 30.32 minutes (for the non-smoker).