QMB 3200 - Final (Exam 2) V2

# Answer selected answer 60 1 question 19 4 out of 4

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Answer Selected Answer: 60 1 Question 19 4 out of 4 points In testing for the equality of means from two independent populations, if the null hypothesis is false, the test could result in: Answer Selected Answer: A Type II error. Question 20 4 out of 4 points If a two-sided null hypothesis is rejected for a single mean at a given significance level, the corresponding one- sided null hypothesis (i.e., the same sample size, the same standard deviation, and the same mean) will_________ be rejected at the same significance level. Answer Selected Answer: Always

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Question 21 4 out of 4 points The power of a statistical test is the probability of rejecting the null hypothesis when it is true. Answer Selected Answer: False Question 22 4 out of 4 points When conducting a hypothesis test about a single mean, other relevant factors held constant, increasing the level of significance from .05 to .10 will reduce the probability of a Type I error. Answer Selected Answer: False Question 23 4 out of 4 points If we are testing the difference between the means of two normally distributed populations with samples of n1 = 10, n2 = 10, the degrees of freedom for the t statistic is ____. Answer Selected Answer: 1 8 Question 24 4 out of 4 points As the level of significance α increases, we are more likely to reject the null hypothesis. Answer Selected Answer: True Question 25 4 out of 4 points
The average customer waiting time 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 system will decrease average customer waiting time in the store. What is the null and alternative hypothesis for this scenario? Answer Selected Answer: H 0 :µ ≥ 7.5 and H A < 7.5

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