Chapter 9.4, Problem 4Q

If flying saucers are a genuine phenomenon, it would follow that the nature of sightings (that is, their physical characteristics) would be similar in different parts of the world. A prominent UFO investigator compiled a listing of ninety-one sightings reported in Spain and eleven hundred seventeen reported elsewhere. Among the information recorded was whether the saucer was on the ground or hovering. His data are summarized in the following table $\left(95\right)$. Let $p_S$ and $p_{NS}$ denote the true probabilities of ‘‘Saucer on ground’’ in Spain and not in Spain, respectively. Test $H_0:p_S=p_{NS}$ against a two-sided $H_1$. Let $\alpha =0.01$.

	In Spain	Not in Spain
Saucer on ground	53	705
Saucer hovering	38	412