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19. All det boxes of a particular type of detergent indicate that they contain 32 ounces of ergent. A government agency receives many consumer complaints that the boxes contain less-than-32 ounces. To check the consumers complaints at the 2% significance level, the government agency buys 100 boxes of this detergent and finds that r= 31.45 ounces and s 2 ounces. Should the government agency order the seller to put more detergent into its boxes? (6 points) 20. A principal of high school was concerned with amount of time her students devote to working at after-school jobs. She randomly selected 25 students, obtained their working hours for 1 week and computed12.3 and s5.4. She claims that her students work significantly more that the mean of 10.7 h from a study conducted by the National Association of State High School Association. Test her claim by using the 5% level of significance. (6 points)

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