Homework 22 Solutions - Name Section Solutions for Suggested Problems from Chapter 22 1 In a recent article it was stated that 40 of U.S workers have

# Homework 22 Solutions - Name Section Solutions for...

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Name: Section: 1. In a recent article, it was stated that 40% of U.S. workers have been treated unfairly at work. A CEO for a large company believes that the percentage is lower than 40%. a. State the appropriate null and alternative hypotheses. H o : p = 0.40 H a : p < 0.40 b. Using a significance level of α =0.05, make a decision to reject or not reject the null hypothesis if the p-value turns out to be 0.0002. Since the p-value is smaller than α (our significance level), we have strong evidence against the null hypothesis. Since we have so much evidence against the null hypothesis, there is little risk in rejecting it. So we reject the null hypothesis. c. Summarize the results using language anyone can understand. Since we rejected the null, we can conclude that less than 40% of all U.S. workers have been treated unfairly at work. 2. A CNN/Opinion Research Corporation poll showed that 55% of U.S. adults think that the government should provide a national health insurance program for all Americans.

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• Spring '08
• wierdhobbitguy
• Null hypothesis, Statistical hypothesis testing