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Selected Answer: A, B, and C Question 7 4 out of 4 points When conducting a hypothesis test about a single mean, reducing the level of significance (?) will increase the size of the rejection region. Answer Selected Answer: False Question 8 4 out of 4 points In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a variance of .09. What is the 90% confidence interval for the true mean length of the bolt? Answer Selected Answer: 2.8140 to 3.1860 Question 9 4 out of 4 points Type II error is defined as the probability of ________________ H 0 , when it should ___________. Answer Selected Answer: failing to reject; be rejected Question 10 4 out of 4 points Given the following information, calculate the degrees of freedom that should be used in the pooled-variance t test. s 12 = 4 s 22 = 6 n 1 = 16 n 2 = 25 Answer Selected Answer: df = 39 Question 11 4 out of 4 points In one-way ANOVA, the treatment sum of squares equals: Answer Selected Answer: SSTO - SS(error) Question 12 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:
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Answer Selected Answer: t < -1.796 Question 13 4 out of 4 points A statistical quality control process for cereal production measures the weight of a cereal box. The population standard deviation is known to be .06 ounces. In order to achieve a 97% confidence with a margin of error of .02 ounces, how large a sample should be used?
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Christopher Reinemann
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