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Different Proportions: Are these proportions statistically different?

2008-08-15 by JJBigThoughts

Coming back to the app stores soon…

Use this to know whether the results of your survey about two populations have a statistically significant difference between them.

Example Usage
=============
A hotel operator routinely survey’s customers and wants to know whether the guests that arrive at night are less likely rate “Recommend” the hotel than her guests that arrive during the day shift.

+—————+—–+————————————+
| Population | n | # that would “Recommend” the hotel |
+—————+—–+————————————+
| Night Arrival | 100 | 67 |
+—————+—–+————————————+
| Day Arrival | 230 | 175 |
+—————+—–+————————————+

Answer: There is not a statistically significant difference at the 95% level (but there is at the 90% level)!

Ok, I’m curious. Update me when you launch this:
Full Name
Email

You’re email won’t be sold, pestered, etc.

Features
=========
* Engligh wording explaining the results
* Pretty arrows indicate which group has a statistically higher response rate, if any.
* Unique “Detailed Results” for the thurow checker.
* Detailed Results Show:
** Shows Actual Inputs to help verify calculations
** Show actual level of significance (say, 75%, instead of your desired 95%)
** Converted response rates to percentages
** z value
** Inverse Cumulative Distribution Function (aka: z from the normal table at the ‘95.00%’ significance level)
* Web Citations
* Suggested Book Links

Note: Requires Internet Access

Known Uses
==========
* Analyzing results of a survey

Known Audiences
================
* Market Researchers
* Survey Administrators
* Statisticians
* Operations Researchers

References
==========
CliffsNotes.com. Test for Comparing Two Proportions. 3 March 2009

StatTrek.com: AP* Statistics Tutorial: Hypothesis Test for Difference Between Proportions. 3 March 2009
http://stattrek.com/AP-Statistics-4/Test-Difference-Proportion.aspx?Tutorial=AP

Web Tools
======
Testing for Statistically Significant Differences Between Two Proportions
http://app.eleganttechnologies.com/php/app/eg/prod/html/BigDeal.php?StrTarget=Web&EnumSource=Iphone&SnAppleDevice=XXX&EnumOutputFormat=Web&EnumAction=Web

Polaris Marketing Basic Statistical Testing Calculator
http://www.polarismr.com/education/tools_stat_diff_prop.html

Kindle Books
============

Paper Books
============
Books: CliffsAP Statistics (Paperback)

Survey Resources
=================
Sterling Research Group
http://bit.ly/19jqus

Filed Under: Different Proportions, Platforms, Products & Apps

Elegant Pythagorean

2008-08-15 by JJBigThoughts

Elegant Pythagorean
—
Find the missing side.


This little app uses the Pythagorean theorem to find the third side of a right triangle. Really. That’s it. It works. It is pretty.

iPhone Screenshot 1

iPhone screenshot

iPad Screenshot 1

iPad scheenshot

Filed Under: Elegant Pythagorean, Platforms, Products & Apps

Elegant Quadratic

2008-08-15 by JJBigThoughts

Quadratic
—
Solve the quadratic equation. Simple. Refined.

 

 

This little app solves quadratic equations for you.  Really.  That’s it.  It works.  It is pretty.

Q: What is a quadratic equation?
A: If you don’t know, then this is the wrong program for you.
Q: Hey – I really want to know.  I think I remember, but I’m not sure.
A: Given an equation in the form of ax^2 + bx + c = 0, then solve for x.
This is available for the following:
Desktop Web (Safari Only)
iPhone App Store (Coming Soon)
iPhone/iPod touch Web App
Android Web App
Android Native
This little app solves quadratic equations for you.  Really.  That’s it.  It works.  It is pretty.Q: What is a quadratic equation?A: If you don’t know, then this is the wrong program for you.
Q: Hey – I really want to know.  I think I remember, but I’m not sure.A: Given an equation in the form of ax^2 + bx + c = 0, then solve for x.  This is available for the following:
Desktop Web (Safari Only)iPhone App Store (Coming Soon)iPhone/iPod touch Web AppAndroid Web AppAndroid Native

Elegant Quadratic on iPhone

Elegant Quadratic in Mobile Browser (click to run)

Elegant Quadratic on Android

Filed Under: Android, Elegant Quadratic, iPad, iPhone & iPod touch, Platforms, Products & Apps

Elegant Word of the Day

2008-08-15 by JJBigThoughts

Elegant Word of the Day
—
Read every day. Great for everyone both kids, and libiophiles, alike.


I picked 365 words for you from a list of real words looked up by real people. The words come from my own dictionary history, from users of ElegantWords, and from suggestions by my friends. Definitions come from the across the Internet and from the my server’s Wordnet dictionary, ensuring you get a broad and modern range of definitions, usages, and contexts. See synonyms, usage samples, and original sources. This uses the same rich definition engine used by ElegantWords.

iPhone Screenshot 1

iPhone screenshot

iPhone Screenshot 2

iPhone screenshot: Word Details

iPhone Screenshot 3

iPhone screenshot: Wikipedia(tm) entry (if applicable)

Filed Under: Elegant Word of the Day, iPhone & iPod touch, Platforms, Products & Apps

Lil’ Math

2008-08-15 by JJBigThoughts

Lil’ Math
—
Read every day. Great for everyone both kids, and libiophiles, alike.


This little app solves simple math problems for you, like 2 + 3, or, if you feel daring, 2 + 3 * (4+2 -8/2). Really. That’s it. It works. It is pretty.

iPhone Screenshot 1

iPhone screenshot

iPhone Screenshot 2

iPhone screenshot

iPhone Screenshot 3

iPhone screenshot

iPad Screenshot 1

iPad screenshot

iPad Screenshot 2

iPad screenshot

iPad Screenshot 3

iPad screenshot

Filed Under: iPad, iPhone & iPod touch, Lil' Math, Platforms

Elegant Words: The Ubiquitous Dictionary

2008-08-15 by JJBigThoughts

Elegant Words
The Ubiquitous Dictionary


 


This is not your father’s dictionary. Words come from the across the Internet and the server’s dictionary, ensuring you get a broad and modern range of definitions, usages, and contexts. See synonyms, usage samples, and original sources.

Perfect for when you are reading a book – never skip a word just because your paper dictionary is too far away or because your computer-based dictionary would mean too much of an interruption from your main task – reading. Keep it handy while reading in bed, on the bus, on the couch, but not in the tub.

Some Reviews
==========
“This is much more practical and functional than the other dictionary apps”

“The pairing of the word definition with other online references like Wikipedia is a nice touch.”

Unique Features
– See word popularity. Hint: “Ubiquitous” is #1
– See how many times a word has been looked up by other people.
– Get your definitions from multiple sources, including Wikipedia.
– Touch the word’s source to visit the web site that originally defined the word, such as that word’s Wikipedia page.
– See how many times you have already looked up a given word.

iPhone Screenshot 1

iPhone screenshot: Looking up 'elegant'

iPhone Screenshot 5

iPhone screenshot: the many definitions of 'fear'

iPhone Screenshot 3

iPhone screenshot: one definition of 'fear'

iPhone Screenshot 4

iPhone screenshot: another definition of 'fear'

iPhone Screenshot 2

iPhone screenshot: The Wikipedia(R) entry (if applicable)

Filed Under: Elegant Words, iPhone & iPod touch, Platforms

Time to Read

2008-08-15 by JJBigThoughts

Time to Read
—
Read every day. Great for everyone both kids, and libiophiles, alike.


Mark your daily reading times with just one tap on this reading timer. You can mark your time as your read. Perfect for daily reading goals that new readers often have in school. This combines empowering your children, like other mark-your-time devices, with the convenience and cool-factor of an iPhone or iPod touch.

For fun: see your lifetime total!

Features:
* Pick your goal
* Big buttons for little fingers
* 3 ways to alarm: Sound (when available), Vibration (when available), and Visual.
* Show when this session started
* Show total elapsed time
* Show time remaining
* Remembers where you left off when returning to the program
* Allows your to keep reading even after meeting your goal to show extra reading
* Big visual marker when meeting your goal for easy display to guardian
* Lots of support options

iPhone Screenshot 3

iPhone screenshot

iPhone Screenshot 4

iPhone screenshot

iPhone Screenshot 5

iPhone screenshot

iPhone Screenshot 2

iPhone screenshot

Filed Under: iPhone & iPod touch, Platforms, Time to Read

Elegant Torch: The nightstand companion

2008-08-15 by JJBigThoughts

Elegant Torch
The nightstand companion
Three little apps in one – book light, nightlight, and power nap timer


What is this?
Elegant Torch was built to live next to your bed. You’ll find a booklight, a nightlight, and a timer for taking short naps. Great for both everyday use and when sleeping in unfamiliar rooms.

Yah, but why?
I tend to read in bed. Shortly after buying my seemingly all-powerful iPhone, the batteries in my traditional book light ran out. I was left in the dark. I tried to use a free flashlight app on the iPhone as a substitute book light. It worked almost well enough, except that it kept going into “Sleep” mode, leaving me in the dark. I developed Elegant Torch to be my new bedtime reading buddy.

Book Light
The Book Light simply turns your device into a book light (aka: flashlight, torch, nightlight, reading light etc.) and there’s also a timer so can see how long you’ve been reading. This is pretty much a bright white screen. It is simple and stable. That’s it. Little else. It’s meant for people who read books with a book light. If I turn up the brightness all the way on the device, then the light is slightly brighter than a typical small book light, but not as bright as the larger book lights. I find it particularly useful as a back-up book light. Nice if batteries in your primary book light run down or if traveling without a book light. It also makes a great emergency flashlight (which is surprisingly useful).

Timed Nightlight
The Timed Nightlight dims after a preset number of minutes. You can change its brightness and color. It can be used, for example, when you are at a hotel, or if your light switches are far away from the bed. It can also be used as a little bedside reminder. I often lose track of time when I’m reading a good book in bed. I sometimes look up and see, to my horror, that 3 hours have just slipped by, destroying any chance of a full night’s rest. Starting the Timed Nightlight will give you a clear but quiet indication that it might be time to go to sleep.

Power Nap
The Power Nap is designed to wake you up from a short sleep. It’s the alarm clock for people too busy for alarm clocks. Say you have 30 minutes before your next class or before your next plane. You would love to catch a few winks, but you don’t want to go through the hassle and risk of setting up a traditional alarm clock. The Power Nap has just two controls. The first control sets the time from 1 to 60 minutes, so there is no risk of getting your AM & PMs mixed up. The second control lets you perform a sound check to ease your anxiety that your device might be muted. The timer visually counts down the time remaining for extra feedback and peace of mind.

Filed Under: Elegant Torch, iPhone & iPod touch, Platforms

Time to Eat: Taming the Kitchen Timer

2008-08-15 by JJBigThoughts

Time to Eat
Taming the kitchen timer
How much is this meeting costing the company? What about costing society?

I designed TimeToEat to help bring a little calmness to the kitchen. When I cook big meals, I’m typically tracking a several things at once, like the sauce on the stove, the sauce next to it, the dessert in the oven, and the wine chilling in the freezer that I forgot to start chilling properly earlier in the day. TimeToEat has four distinct countdown timers, plus a summary screen to track each one.

Unique Feature
==============
* Four countdown times in one application.
* Each timer has its own screen.
* A front page gives summary information.
* Navigate to each timer by either tapping the dots at the top, by swiping, or by the right-arrow on the front page.
* Enter a note for each timer, like “Sauce” or “Rice.” This note is also shown on the front page.
* Easy Start, Pause, & Restart, even on the summary page.
* Keep track of when you started a timer.
* Keep track of elapsed time, even if you paused the timer.
* Displays the Completion Time to quickly help you plan other prep times.
* A “Test Your Alarm Button” on every page to help avoid the otherwise real risk of not hearing an alarm on accidentally muted device.

iPhone Screenshot 1

iPhone Screenshot 2

iPhone Screenshot 3

iPhone Screenshot 4

Filed Under: iPhone & iPod touch, Platforms, Time to Eat

Meeting Timer: Time is Money

2008-08-15 by JJBigThoughts

Meeting Timer
Time is Money
How much is this meeting costing the company? What about costing society?

Everyone knows that time is money. And everyone knows that meetings can be a total waste of time. As such, meetings can waste a lot of money. But just just how much? Download this app to find out.

Here’s how it works: Start the app at the beginning of a meeting. Spend a few of those pointless minutes guessing the Hourly Cost Per Attendee. Enter how many people are in the meeting. Then watch the running total grow as the seconds tick by. Instead of doodling on your note pad, you’ll be able to watch your product’s price increase and your bonus pool decrease.

Every meeting you attend will be added to your Lifetime Total, so instead of analysing your colleague’s new facial hair, you’ll be able to think about what you really could have done with those wasted hours. Perhaps you could have improved your own productivity, learned Mandarin, or built a house from scratch.

And every meeting added by every Meeting Timer user will go into a World Wide Loss Total, so instead of resenting about yet another meeting, you can solve the current global financial crisis.

Just don’t show this to your boss, because he or she will probably stop calling pointless meetings. And then you’d have to work!

iPhone Screenshot 1

iPhone screenshot

iPhone Screenshot 2

iPhone screenshot

iPhone Screenshot 3

iPhone screenshot: Changing average charge

iPhone Screenshot 4

iPhone screenshot: for British Pound locale

iPhone Screenshot 5

iPhone screenshot: for Euro locale

Filed Under: iPhone & iPod touch, Meeting Timer, Platforms

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