Post a New Question

Statistics

posted by on .

A quality control inspector wants to estimate the mean inside diameter of the washers produced by a
certain machine. A preliminary sample indicates that the inside diameters have a standard deviation
of 0.30 millimeters. What sample size does he need to estimate the mean to within an error of E = 0.02
millimeters with 90% confidence?

  • Statistics - ,

    90% = mean ± 1.645 SEm

    SEm = SD/√n

    .02 = 1.645 SEm

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question