Refer to Exercise 16.48. Predict with 90% confidence how definite is the intention to vote for one 50-year-old.

In exercise 16.48

In most presidential elections in the United States, the voter turnout is quite low, often in the neighborhood of 50%. Political workers would like to be able to predict who is likely to vote. Thus, it is important to know which variables are related to intention to vote. A political pollster took a random sample of registered voters 3 months before an election. Each respondent was asked the following question, “How definite is your intention to vote or not?” The results were recorded as 1 = Definitely will not vote; 2, 3, 4, 5, 6, 7, 8, 9, 10 = Definitely will vote. Also recorded was the age of the respondent. Is there sufficient evidence to infer that age (AGE) and intention to vote (DEFINITE) are linearly related?