AMS 5 Chapter Notes - Chapter 21-23: Simple Random Sample, Confidence Interval, Normal Distribution
9 Oct 2017
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A simple random sample of 3,500 people age 18 or over is taken in a large town to estimate the percentage of people (age 18 and over in that town) who read newspapers. It turns out that 2,487 people in the sample are newspaper readers. The standard error is estimated as . 8 of 1%, because. 35001/2 * (. 71*. 29)1/2 ~ 27, 27/3500 * 100% ~ . 8 of 1% (a) 71% +/- 1. 6% is a ___ for the ___. Yes, since that is the right method for finding the se. Equation; expected percentage of people who read newspapers plus/minus the error. According to statistical theory, the guarantee should be interpreted as follows: (i) In virtually all these surveys, the estimates will be within two percentage points of the parameters. (ii) In most such surveys, the estimates will be within two percentage points of the parameters, but in some definite percentage of the time larger errors are expected.
