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PART A

A baseball coach reviews the number of runs hit per game for the past several seasons. Since the team plays so many games, he selects a random sample of 10 games and records the number of runs scored in each game. The average number of runs scored is E:- with a standard deviation of 3.8 runs. Compute the margin of error given a condence level of 99%. [Use a table or technology. Round your answer to three decimal places.) I USE SALT Given a population that is approximately normal, find the following. (Use a table or technology. Round your answers to three decimal places.) In USE SALT (a) Find the t critical value associated with 95% confidence with 5 df. (b) Find the t critical value associated with 99% confidence with 16 df.A local band was interested in the average song time for rock bands in the 1990s. They sampled eight different rock bands and found that the average time was 3.72 minutes with a standard deviation of 0.27 minutes. Calculate the 95% confidence interval (in minutes) for the population mean. (Use a table or technology. Round your answers to three decimal places.) USE SALT minPublic health and safety officials have classified the Zika virus as a hazardous threat to pregnant women in Brazil. A study based in Rio found the virus to be more active near a body of water that was found to be polluted. A study of 20 water samples found an average chemical waste of 212 g per mile with a standard deviation of 15.56 g. LA USE SALT (a) What are the degrees of freedom for this study? (b) Find the 95% confidence interval (in g per mile) for this study. (Use a table or technology. Round your answers to three decimal places.) g per mile (c) What would happen to the margin of error if the sample size increased? O It would also increase. O It would decrease. O It would stay the same. O It would go to zero. (d) What would happen to the margin of error if the confidence level increased? O It would also increase. O It would decrease. O It would stay the same. O It would go to zero