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hypotheses?

(c) Describe the results using a 95% confidence interval for the difference in proportions.

9.41 PTC is a compound that has a strong bitter taste for some people and is tasteless for others. The ability to taste this compound is an inherited trait. Many studies have assessed the proportions of people in different populations who can taste PTC. The foliowing table gives results for samples from several countries:²⁶

		Country
Taster	Ireland	Portugal Norway	Italy
Yes	558	345 185	402
No	225	109 81	134

Complete the table and describe the data. Do they provide evidence that the proportion of PTC tasters varies among the four countries? Give a complete summary of your analysis.