A manufacturer of salad dressings uses machines to dispense liquid ingredients into bottles that move along a filling line. The machine that dispenses salad dressings is working properly when 4.4kg...

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Extracted text: A manufacturer of salad dressings uses machines to dispense liquid ingredients into bottles that move along a filling line. The machine that dispenses salad dressings is working properly when 4.4kg are dispensed. Suppose that the average amount dispensed in a particular sample of 20 bottles is 4.34kg with a sample variance :0.0175kg². It is of interest to know if the machine should be stopped and Xn production wait for repairs. Assume that the data follows a normal distribution. Which of the following statements are true? Based on the provided evidence, the machine should be stopped for repairs with a significance level a = 0.1. The test statistic follows a t-Student distribution with 19 degrees of freedom. The test-statistic has an observed value of 2.0284. The test statistic follows a normal distribution with mean u = 4.4 and variance o2 0.0175.