Mathematics, 26.03.2020 22:22 salinasroel22
In a survey of 215 adult Americans, it was found that the average amount of sleep per night is 7.8 hours with a standard deviation of 1.2 hours. How many adult Americans would need to be surveyed to estimate the mean amount of sleep per night within 0.12 hour with 95% confidence?
Answers: 1
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
.
, so 
is the standard deviation of the population and n is the size of the sample.
. So
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In a survey of 215 adult Americans, it was found that the average amount of sleep per night is 7.8 h...
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