Playing with statcrunch part 1

PLAYING WITH STATCRUNCH PART 1

B Heard

These charts are not to be posted or used without my permission. Students may download a copy for personal use.

PLAYING WITH STATCRUNCH PART 1First let me note that I use Minitab in my live lectures because the course is mainly based on Minitab.

This presentation and those that follow throughout the term are simply a “diary” of sorts as I use Statcrunch on various problems.

A student in one of my classes noted that he used it and liked it, thus I thought I would play around with it and share my findings.

That is the wonderful thing I enjoy about teaching – I get to learn.

This should be applicable to both undergraduate and graduate students.

I am not advising you to use Statcrunch, rather than Minitab (not at all). However, I want to see what it will do.

PLAYING WITH STATCRUNCH PART 1Homework Problem Example HMWK #15, Week 1, Math 221

Click icon andChooseOpen in

StatCrunch

PLAYING WITH STATCRUNCH PART 1Ok, it opens in StatCrunch and looks pretty cool

I did this tutorialand found it interesting,

but I will show you how towork this one…

PLAYING WITH STATCRUNCH PART 1I clicked the Graph button and chose Stem and Leaf

Let’s see what it looks like…

PLAYING WITH STATCRUNCH PART 1I clicked on var1

Chose “None” for

Outlier Trimming and

didn’t mess with

anything else

Of course I hit the

Compute button!

PLAYING WITH STATCRUNCH PART 1It gave me this… Which is perfect.

By looking at the plot, you can see that

“Most of the values are below 149”

The follow up questions can be

confusing, just be careful.



StatCrunch

PLAYING WITH STATCRUNCH PART 1It opens in StatCrunch just as the first one did. The first cell with the 5 highlighted just opens that way and doesn’t seem to affect anything. Let’s push some buttons.

PLAYING WITH STATCRUNCH PART 1I clicked Stat, chose Summary Stats, then Columns

PLAYING WITH STATCRUNCH PART 1They ask for the mean, median and mode.

I clicked on var1 and it shows up on the right

They ask for the mean, median and mode, but

just in case they ask for something else, I chose

a few more …

Under Statistics, Hold down the Ctrl key and

Select what you want…

I chose Mean, Variance, Std. dev., Median,

Range and Mode… Compute! Button…

PLAYING WITH STATCRUNCH PART 1Bazinga! Just make sure to round properly…


No data to open onthis one, so let’s see what

we can do…Click StatCrunch on the right

PLAYING WITH STATCRUNCH PART 1StatCrunch opens blank

PLAYING WITH STATCRUNCH PART 1Click Stat, Choose Calculators, then choose Normal

PLAYING WITH STATCRUNCH PART 1Click the Between button (top) Enter Mean of 180, Std. Dev. Of 9

Enter 153 for the left side, 207 for the right side

Hit the Compute button and stand back…

PLAYING WITH STATCRUNCH PART 1It’s dead on… however, I would round these to one decimal place (% form) if they say Do Not Round, since we are dealing with the Empirical Rule. In other words, note 99.7% as your answer

Remember, 0.997 is 99.7%

The second part was just as easy.


No data to open onthis one, so let’s see what

we can do…Click StatCrunch on the right

PLAYING WITH STATCRUNCH PART 1StatCrunch opens blank

PLAYING WITH STATCRUNCH PART 1Click Stat, Choose Calculators, then choose Normal

PLAYING WITH STATCRUNCH PART 1Click the Between button (top) Enter Mean of 1300, Std. Dev. Of 300

Enter 1000 for the left side, 1600 for the right side

Hit the Compute button and stand back…

PLAYING WITH STATCRUNCH PART 1Ok, we see that it is roughly 68%

However, they asked us “How many farms out of 78”

So we multiply (0.68)(78) and get 53.04, so we would say “53” and we would nail it!

Then they asked something about out of 26 farms… You would again say (0.68)(26) = 17.68 and round to “18”



StatCrunch

PLAYING WITH STATCRUNCH PART 1Once it opens in StatCrunch, click Stat, then choose Summary Stats, then Columns

PLAYING WITH STATCRUNCH PART 1When it opens, click on var 1 (it will then show on right)

Under Statistics, Hold down Ctrl key and select Min, Median, Max, Q1 and Q2

Bazinga the Compute! Button

PLAYING WITH STATCRUNCH PART 1It gives us what we asked for…

Remember the Median and Q2 are the same thing!

StatCrunch will also give you a Boxplot similar to a Box and Whiskers.

You go to graph, choose Boxplot, click var1, check box next to “Draw boxes horizontally” and add a Median marker… You can tell the correct one if they give you a multiple choice… Keeping in mind your 5 Key values (Median, Min, Max, Q1 and Q3)

I drew colored lines to them on the

PLAYING WITH STATCRUNCH PART 1I will note again that I did this just to see what it will do.

It seems to do a great job…

However, lectures will continue to be based on Minitab.

I will “try” to some questions in StatCrunch and post the link here in the StatCave in coming weeks based on my time. (I can’t promise this, but I will try when possible.)

Playing with statcrunch part 1

Education

Transcript of Playing with statcrunch part 1