Assignment 8: Single Sample Inferences Due at start of class on 10 March, 2006.

Each question is worth one half of one point unless otherwise indicated.

The mean IQ is 100 with a standard deviation of 15. The mean IQ of a random sample of 21 UD students is 115. Is the IQ of UD students likely to be different from the average IQ of the population?

Assume that the mean life span is 74.9 years. The mean life span of 24 individuals who owned cats was 79.3 years, with a standard deviation of 5.7 years. Do owners of cats live longer than the population?