Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.025) and its Z score.
95% = mean ± 1.96 SEm
SEm = SD/√n
A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of 1065 people age 15 or older, the mean amount of time spent eating or drinking per day is 1.62 hours with a standard deviation of 0.51 hour.
(1)Determine and interpret a 95% confidence interval for the mean amount of time Americans age 15 or older spend eating/drinking each day.
(A)The nutritionest is 95% confident that the mean amount of time spent eating or drinking per day for any is between ___, and____ hours.
1 answer
1 answer