QMB 3200 - Final (Exam 2) V2

# A random sample of 12 customer transactions has been

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cashier system will decrease the average customer waiting time in the store. A random sample of 12 customer transactions has been recorded. At a significance level of .05, what is the rejection point condition? We would reject the null hypothesis if: Answer Selected Answer: t < -1.796 Question 14 4 out of 4 points First a 90% confidence interval is constructed from a sample size of 100. Then, for the same identical data, a 92% confidence interval is constructed. The width of the 90% interval is wider than the 92% confidence interval. Answer Selected Answer: Fals e Question 15 4 out of 4 points If we are testing the hypothesis about the mean of a population of paired differences with samples of n1 = 10, n2 = 10, the degrees of freedom for the t statistic is ____. Answer Selected Answer: 9 Question 16 4 out of 4 points When comparing two independent population means, if n1 = 13 and n2 = 10, degrees of freedom for the t statistic is 22. Answer Selected Answer: False Question 17 4 out of 4 points

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There are two types of machines called type A and type B. Both type A and type B can be used to produce a certain product. The production manager wants to compare efficiency of the two machines. He assigns each of the fifteen workers to both types of machines to compare the hourly production rate of the 15 workers. In other words, each worker operates machine A and machine B for one hour each. These two samples are independent. Answer Selected Answer: False Question 18 4 out of 4 points In a manufacturing process, we are interested in measuring the average length of a certain type of bolt. Past data indicates that the standard deviation is .25 inches. How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?

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