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.

SBIQ

Format

A data frame with 80 observations on the following 2 variables:

• score (IQ score)

• county (factor with levels County1 and County2)

References

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.

Examples

ggplot(data = SBIQ, aes(sample = score, color = county)) + stat_qq()