A state job service employee wishes to estimate the mean number of people who register with the service each week. How many weeks should be sampled in order to estimate the mean number of weekly registrants? The employee would like the margin of error to be less than 0.5 with probability of 0.95. Past records show the weekly standard deviation to be 2.5.
______________ weeks

Margin of Error

An expression of the amount of random sampling error in a survey's results, indicating the range within which the true population parameter is likely to lie.

Mean Number

Typically refers to the average value of a set of numbers, calculated by dividing the sum of all numbers by the count.

Registrants

Individuals who have officially signed up or registered for an event, program, service, or platform.