The typical amount of sleep per night for undergraduate coll

The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 7 and a standard deviation of 1.60 hours. Based on this distributional we can conclude that at least 68% of this population sleep between

Solution

so we need to find the confidence interval at 68%

=>

margin of error = z-score * standard deviation

= 0.9945 * 1.6 = 1.5912

confidence interval = mean +/- margin of error

= 7 +/- 1.5912

= (5.41 , 8.59)

so 68% of population sleep between 5.41 hours and 8.59 hours