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Question: Here is an example of the results of experiments that asked the question, Can you get more attitude change from an audience by presenting just one side of an argument and claiming that it is correct, or should you present both sides and then claim that one side is correct? In this experiment, a second independent variable was also examined: amount of education. The first table contains the mean change in attitude, and the second is the ANOVA summary table.
Why do you use the chi-square statistic? Explain. What type of data is used with chi square analysis? Explain. What are the hypotheses in a chi-square test for independence? Explain.
Fred received the following scores for his gymnastics routine: 8.5, 7.8, 8.0, 6.8, 7.1, 7.6. To figure out his score, the judges drop the highest and lowest score and then average the rest of his scores.
Determine test statistic in 2 decimal places. Determine p value in 4 decimal places. Does the evidence support the claim of a mean reaction?
When Gallup asked the same question in 2001, only 45% of those respondents agreed. Is it reasonable to conclude that there was a change in public opinion given that the P-value is 0.37? Explain.
The booming economy of the 1990s created many new billionaires. The 1999 Forbes 400 ranks the 400 wealthiest people in the US. The top 15 billionaires on this list are described in the table above right.
Recognize and describe potential threats (up to 3) to internal validity.
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
Generate a test question and model your answer to that for critical areas of learning.
Use each decision criterion (maximin, maximax, minimax regret, expected value) to determine the price that Pizza King should charge.
Determine the failure rate and the reliability. Find the probability that the machine operates for at least 12 hours before breaking down.
Baseball games are uniformly distributed between 160 minutes and 240 minutes. What is the probability that a 9-inning game will last between 180 and 220 minutes?
A company believes its market share is about 14%. Find the minimum required sample size for estimating the actual market share to within 5% with 90% confidence.
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