# Testing

• ### Significance

by Lawrence Mark Lesser

When doing hypothesis tests,
There's no threshold value that's best.
It's very contrived
To use point-oh-five
To say if you should be impressed!

• ### When I'm Point Oh-Four

Lyrics copyright by Dennis K Pearl
May sing to the tune of "When I'm Sixty-Four" (Beatles)

When collecting data, try to be fair
Many years from now
Will you still have a null value defined
Test to construct, with a p to find?
If I get one ‘n three-quarters for zee
Would you lock the door?
Where should p lead you, will you still need me
When I'm point oh-four?

If the science changes
Shouldn’t the test?
I could work in stages

Take mu as random, don’t draw me a line
Indicate precisely what your mean will say
Information wasting away
Give me your posterior, and its form
changing evermore
Where should p lead you, will you still need me
When I'm point oh-four?

• ### Nonparametric Tests

A sign test has its pluses and minuses but the Wilcoxon does first things first.

Larry Lesser

• ### In Denial

I was in denial about using a non-parametric test - but the signs were all there.

Dennis Pearl

• ### Poem: Hypothesis Testing

Two groups in random selection
The differences under inspection
On an interval scale
And a test with one tail
The hypothesis suffers rejection

• ### Hypothesis Test with Coke and Pepsi

Students learn the ideas of hypothesis testing in an activity where they guess which of three sodas is the different one.

• ### Fail to Reject

by Lawrence Mark Lesser

He asks, “How can you mix social justice with teaching statistics?”
I’m thinking: how can you not?
How better to illuminate
deviation from expected values?

He says, “But it’s not neutral.”
Like it’s natural and neutral to teach from books
based on baseball, playing cards, and flatscreen TVs
rather than view by neighborhood things like

incidence of asthma or
incidents of racial profiling.
We’ve been testing
a null that dulls

by what’s normalized
as if the type
1 error
is always worse.

When he says social justice is beyond our scope,
I want to ask: do you mean
our discipline or
our humanity?

• ### The Psychic

Jan: I predict conventional p-value usage will decrease.
Lainie: You sound like a psychic.
Jan: How so?
Lainie: The "p" should be silent!

Larry Lesser