# BUS 233

## No Standard Deviation? How do I get the standardized test statistic?

I get this question a lot in my BUS 233 Business Statistics course. It comes when students see a problem similar to the following in their homework or on a quiz: In a sample of 1000 home buyers, you find that 457 home buyers found their real estate agent through a friend. At α=0.08, can …

## Single Sample, Sigma Known Hypothesis Test for a Mean

We are starting true tests of hypotheses and it is critical to get off on the right foot. I will add some useful info here shortly, but first I am sharing a question on a homework problem that is a good example of what you will see in the second half of the course.   …

## One more time: p-values redux

It’s time for science to abandon the term ‘statistically significant’ – David Colquhoun | Aeon Essays

## Understanding the t-statistic

Understanding the Student’s t distribution

## When do I substract from 1?

Always sketch the normal curve situation first. Remember the Standard Normal Distribution tables almost always give the area/probability from left infinity to the z-value in question; check for sketches on the tables you use to confirm. The Excel Norm.xxx functions also return the probability to the left of the z-value in question. If the problem …

## Thoughts on Section 7.4 for Mia

Mia, In rereading your email, I am seeing several problems you say you are having with the section on proportions. Identify the test When you are working with one or two proportions, you always use a Z-test. Knowing that simplifies the calculation of the critical value – we are always looking for values of Z. …

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