The Impact of Innumeracy
By the time we reach voting age, almost all Americans have at least a high school education. That means we have been exposed to numerous math courses, and hopefully passed them. But that does not… The Impact of Innumeracy
Is Eight Weeks Enough for Mastery?
Back in the dark ages of my undergraduate degree at the Air Force Academy, terms were the still traditional 15 weeks, more or less. And after a period of adjustment to the rigors of that… Is Eight Weeks Enough for Mastery?
Why Study Statistics?
I found these two short videos while looking for an introductory video for my upcoming BUS 233 course. The first one is great and includes Roger Peng, “my” instructor in the Data Science Specialization I’m… Why Study Statistics?
StatCrunch Tutorial Videos
StatCrunch is a great statistical analysis app that resides on the web and thus works equally well for both PC and MAC users. If you are taking a stats course and do not have good Excel skills, I suggest you consider learning to use StatCrunch. My sense is that students find StatCrunch’s learning curve, the time and effort needed to get up to a reasonable skill level, is much shorter and not as steep as learning both basic Excel skills and how to use Excel’s statistical formulas to crunch the numbers. This is especially true for short time frame, i.e. 8-week term, introductory statistics classes.
StatCrunch homepage If you bought access to MyStatLab, which has StatCrunch embedded, you should be able to use your Pearson MySTatLab to log in here. If you no longer have access to MyStatLab, you can purchase a 6 or 12 month access key for $13.75/$24.20.
StatCrunch Examples: If you prefer written instructions, this page contains links to StatCrunch Tutorial Videos
Setting up Hypothesis Tests
The Null and Alternative
The most common problem I noticed on this assignment was caused by failing to properly identify the appropriate null and alternative hypotheses. In part, this is due to the Evans text’s somewhat confusing explanation of how to do this – the “burden of proof” approach. There is a much simpler approach that always works.
First, make sure you closely read the problem statement looking for key words and phrases. This table may help:
The null hypothesis always Setting up Hypothesis Tests
