There are 559 full-service restaurants in Delaware. The mean number of seats per restaurant is 99.2. [Source: Data based on the 2002 Economic Census from U.S. Census Bureau.]
Suppose that the true population mean µ = 99.2 and standard deviation a = 21 are unknown to the Delaware tourism board. They select a simple random sample of 50 full-service restaurants located within the state to estimate μ. The mean number of seats per restaurant in the sample is M = 103.4, with a sample standard deviation of s 18.2.
The standard deviation of the distribution of sample means (that is, the standard error, om) is ___________ (Note: Although u and o are unknown to the Delaware tourism board, they are known to you for the purposes of calculating these answers.)
