19.) Data from the Bureau of Labor Statistics reports that the typical manufacturing worker in Wisconsin in 1997 earned a weekly salary of $424.20. Suppose you wanted to see if this were true just in the far Southeastern portion of the state. You obtain a sample of tax returns for manufacturing workers in Racine and Kenosha for the year 1997. Your sample consists of 54 workers and has a mean weekly salary of $432.69 with a standard deviation of $33.90 At a 90% confidence level test the claim that manufacturing workers in Racine and Kenosha had the same salary as workers across the state. 20.) You're not sure if your car battery is going to make it through the winter. You test it several times to see what the voltage is. After testing it 14 times you find the mean voltage is 87 with a standard deviation of 9. Find a 90% confidence interval for the true average voltage in the battery. 21.) Being unattractive and uncharismatic I go to a mail order bride company and consider potential wives. My initial assumption is that most of the girls are after green cards and will be terrible wives after their immigration status is permanent. After talking to one girl, call her Miss Tereshchenko, I decide she is a terrible 2 gold digger when in fact she would have been nice to me. Another girl, Miss Zhang, seems very sweet and nice so I marry her and discover after the green card is processed that she is actually a dreadful person who berates me for not generating enough income to finance her consumption intensive lifestyle. Was Miss Tereshchenko a type 1 error or a type 2 error? How about Miss Zhang