Question

Researchers investigating temperament in dogs have a database of reactivity scores from a population of N = 1000 puppies.  The reactivity scores are normally distributed with a mean of m = 180 and a standard deviation of s = 20; higher scores indicate higher reactivity (that is, the puppy is more likely to become aroused by novel stimuli).

Dr. Santos is conducting temperament tests at a large local animal shelter, and uses a sample of n = 70 puppies.  He would like to compare the results of his tests to those contained in the database.

1. What is the likelihood that Dr. Santos will obtain a mean reactivity score of 168 or lower?

Answer 1

Thank you.