STATISTICS 2014 Quiz 6- STA Quiz 6 Latest Questions and Answers

Results All Answers, Submitted Answers, Correct Answers, Feedback, Incorrectly Answered Displayed Questions Question 1 2.5 out of 2.5 points Do one of the following, as appropriate: (a) Find the critical value zα/2, (b) find the critical value tα/2, (c) state that neither the normal nor the t distribution applies. 99%; n = 17; σ is unknown; population appears to be normally distributed. Selected Answer: t α/2 = 2.921 Answers: zα/2 = 2.583 zα/2 = 2.567 tα/2 = 2.921 tα/2 = 2.898 Question 2 2.5 out of 2.5 points Use the confidence level and sample data to find a confidence interval for estimating the population μ. Round your answer to the same number of decimal places as the sample mean. A group of 59 randomly selected students have a mean score of 29.5 with a standard deviation of 5.2 on a placement test. What is the 90% confidence interval for the mean score, μ, of all students taking the test? Selected Answer: 28.4 μ 30.6 Answers: 27.8 μ 31.2 28.4 μ 30.6 27.9 μ 31.1 28.2 μ 30.8