Homework SourseA simple random sample of fish is taken from a population th
A simple random sample of fish is taken from a population that has a mean length of 80 cm and a standard deviation of 20 cm. how large of a sample is needed so that the sampling distribution of X has a standard deviation of 1 cm?
A simple random sample of fish is taken from a population that has a mean length of 80 cm and a standard deviation of 20 cm. how large of a sample is needed so that the sampling distribution of X has a standard deviation of 1 cm?
A simple random sample of fish is taken from a population that has a mean length of 80 cm and a standard deviation of 20 cm. how large of a sample is needed so that the sampling distribution of X has a standard deviation of 1 cm?
Solution
As
standard error = s / sqrt(n)
Thus,
1 = 20 / sqrt(n)
sqrt(n) = 20
n = 400 [ANSWER]
