MATH 10041 Chapter Notes - Chapter 7: Standard Deviation, Standard Error, Statistical Parameter
21 Mar 2019
School
Department
Course
Professor
Document Summary
If a rifleman"s gunsight is adjusted incorrectly, he might shoot bullets consistently close to 2 feet left of the bull"s-eye target. Does this show lack of precision or bias: lacks bias, draw a second sketch of the target if the shots are both unbiased and precise (have little variation). The rifleman"s aim is not perfect, so your sketches should show more than one bullethole. If a rifleman"s gunsight is adjusted correctly but he has shaky arms, he might shoot bullets scattered widely around the bull"s-eye target. Draw a sketch of the target with the bullet holes. Does this show variation (lack of precision) orbias: lack of precision, suppose that, when taking a random sample of three students" gpas, you get a sample mean of 3. 90. This sample mean is far higher than the college-wide (population) mean. What else could have caused this high mean: the sample may not be biased.
