Tiêu đề UniTutor GiveAway_Final SB.docx ✅

  A.  Yes. B.  No. C.  It depends on μ. z is always smaller than t (ceteris paribus) so the interval would be narrower than is justified.   AACSB: Analytic Blooms: Apply Difficulty: 2 Medium Learning Objective: 08-06 Know when to use Student's t instead of z to estimate μ. Topic: Confidence Interval for a Mean (μ) with Unknown σ   55. A random sample of 16 ATM transactions at the Last National Bank of Flat Rock revealed a mean transaction time of 2.8 minutes with a standard deviation of 1.2 minutes. The width (in minutes) of the 95 percent confidence interval for the true mean transaction time is:    A.  ± 0.639 B.  ± 0.588 C.  ± 0.300 D.  ± 2.131 The width is ts/(n) 1/2 = (2.131)(1.2)/(16) 1/2 = 0.639.   AACSB: Analytic Blooms: Apply Difficulty: 2 Medium Learning Objective: 08-06 Know when to use Student's t instead of z to estimate μ. Topic: Confidence Interval for a Mean (μ) with Unknown σ   56. We could narrow a 95 percent confidence interval by: