QMB 3200 - Final (Exam 2) V2

# QMB 3200 - Final (Exam 2) V2 - Question 1 4 out of 4 points...

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Question 1 4 out of 4 points The average waiting time per customer at a fast food restaurant has been 7.5 minutes. The customer waiting time has a normal distribution. The manager claims that the use of a new 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 2 4 out of 4 points Everything else being constant, increasing the sample size decreases the probability of committing a Type II error. Answer Selected Answer: True Question 3 4 out of 4 points A sample set of weights in pounds are 1.01, .95, 1.03, 1.04, .97, .97, .99, 1.01, and 1.03. Assume the population of weights are normally distributed. Find a 99 percent confidence interval for the mean population weight. Answer Selected Answer: [.965 1.035] Question 4 4 out of 4 points When the level of confidence and the sample size remain the same, a confidence interval for a population mean μ will be wider, when the sample standard deviation σ is small than when σ is large. Answer Selected Answer: False

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Question 5 4 out of 4 points Given the following information, calculate s p 2 , the pooled sample variance that should be used in the pooled-variance t test. s 1 2 = 4 s 2 2 = 6 n 1 = 16 n 2 = 25 Answer Selected Answer: s p 2 = 5.3 Question 6 4 out of 4 points The null hypothesis is a statement that will be accepted only if there is convincing sample evidence that it is true. Answer Selected Answer: False Question 7 4 out of 4 points When carrying out a large sample test of H 0 : µ = 10 vs. H a : µ > 10 by using a rejection point, we reject H 0

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