The average speed of greyhound dogs is about 18.9 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 40 of her dogs, they ran, on the
Average, 19.4 meters per second with a standard deviation of 1.4. Is her claim correct?
A) Yes, because 0.06 falls in the critical region
B) No, because 0.06 falls in the critical region
C) Yes, because 2.26 falls in the critical region
D) No, because 0.5 falls in the critical region

Question

Quizplus · Accepted Answer

The test statistic is calculated as (19.4 - 18.9) / (1.4/√40) = 2.26. If this value falls in the critical region (typically beyond ±1.96 for a 95% confidence level), the claim is supported.

The Average Speed of Greyhound Dogs Is About 18