The weight of a product is measured in pounds. a sample of 50 units is taken from a recent production. the sample yielded x⎯⎯⎯ = 75 lb, and we know that σ2 = 100 lb. calculate a 99 percent confidence interval for μ.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.