3 . An increase in walking has been shown to contribute to a healthier life-style. A sedentary Amer…

3 . An increase in walking has been shown to contribute to a healthier life-style. A sedentary American takes an average of 5000 steps per day: A group of health-conscious employees of a large health care system volunteered to wear pedometers for month to record their steps. It was found that a random sample of 40 walkers took an average of 5430 steps per day; and the population standard deviation is 600 steps. At a = 0.05_ can it be concluded that they walked more than the mean number of 5000 steps per day? marks)

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