County IQ

A school psychologist administered the Stanford-Binet intelligence quotient (IQ) test in two counties. Forty randomly selected, gifted and talented students were selected from each county. The Stanford-Binet IQ test is said to follow a normal distribution with a mean of 100 and standard deviation of 16.

Format

A data frame with 40 observations on the following 2 variables:

County1

IQ scores for county one

County2

IQ scores for county two

Source

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.

Examples

with(data = SBIQ, qqnorm(County1))
with(data = SBIQ, qqline(County1))
# Trellis Approach
qqmath(~County1, data = SBIQ, type=c("p", "r"))