According to a population census in 1986, the percentage of males who are 18 or 19 years
Chapter 8, Problem 8.3-9(choose chapter or problem)
According to a population census in 1986, the percentage of males who are 18 or 19 years old and are married was 3.7%. We shall test whether this percentage increased from 1986 to 1988. (a) Define the null and alternative hypotheses. (b) Define a critical region that has an approximate significance level of = 0.01. Sketch a standard normal pdf to illustrate this critical region. (c) If y = 20 out of a random sample of n = 300 males, each 18 or 19 years old, were married (U.S. Bureau of the Census, Statistical Abstract of the United States: 1988), what is your conclusion? Show the calculated value of the test statistic on your figure in part (b).
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