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Course Documents
Chapter 1 - Intro
Chapter 2 - Methods for Describing Sets of Data
Chapter 3 - Probability
Chapter 4 - Discrete Random Variables
Chapter 5 - Normal Random Variables
Chapter 6 - Sampling Distributions
Chapter 7 - Confidence Intervals
Chapter 8 - Tests of Hypothesis: One Sample
Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples
Sample Exam I: Chapters 1 & 2
Sample Exam II: Chapters 3 & 4
Sample Exam III: Chapters 5 & 6
Sample Exam IV: Chapters 7 & 8
Hi professor
For 14.4 question 15: why is the Ho equal to 145 and not greater than or equal to 145? Because in the problem it states that that class should be able to finish exam 3 in less than 145 min.
Thank you
Posted to STATS 2 on Monday, December 2, 2013 Replies: 1
Hi Shirley,
If the median is 145, then half of the values would be less than 145 (and half would be more). Since the problem states that half the class will finish before 145 minutes, it implies that the median is 145. If the median was less than 145, then more than half of the class would finish before 145 minutes. For example what if the median was 140? Then half of the values would be less than or equal to 140. This means more than half would be less than or equal to 145. That would not be equivalent to what was stated in the claim in this problem.
Hope that helps,
Professor McGuckian