Given a Discrete Probability Distribution such as the one shown below make sure that the sum of the given probabilities is 100% or 1 . If you own a TiNspire CX you can enter the distribution in the top two boxes of the Statistics Made Easy App available at
Once done you get the expected value , variance : step by step.
Optional is the value of N which allows to compute P(X>N) , P(X<N) etc
For a uniform distribution , you enter the given interval [a,b] and the value c which lies on [a,b] . You will then find P(X<c) and P(X>c)
Below is a typical Normal Distribution problem that will be solved further below using the
Statistics Made Easy app .
Using the Normal Distribution feature in the Statistics Made Easy app , we enter the given mean and standard deviation in the top box use 0 and 19 for A and B to 0.0324 or 3.24% .
For question 2 we use 90 and 130 instead in the 2. box to 85.83%
For the 3. question we use 130 as A and some large B such as 500 (or 1000) to get 0.1092 or 10.92% as the answer.
For Sampling Distribution we use the Central Limit Theorem
and enter the known mean, standard deviation and sample size to get the sampling distribution
N(mean, std dev/square root(n) ). Here we get 114 and 1.3
Since the sampling distribution is a normal distribution , we go to the previous and only change the standard deviation to 1.3 instead of 13. Below, we type in the given 110 and 116 to get 93.6986%
That was not too difficult at all! It was easy..
If your Stats teacher is asking you to compute things such as:
Lower & Upper Inner (Outer) Fence
5 Number Summary
and you have a Tinspire CX CAS then head over to
Statistics Made Easy which actually makes Statistics a lot easier: Finding Mean, Median, Mode, Standard Deviation, Variance, Fences, IQR, Statistical Tests, Distributions, Confidence Intervals and a whole lot more …
Using Statistics Made Easy at https://www.tinspireapps.com/?a=SPME and menu item
Linear Regression you just type in the given x and y values. Next the linear regression is computed for you along with the Correlation Coefficient and the Coefficient of Determination.
I love the Statistics features, it really helped me understand through a different point of view.
I’ve always dreamed of an application like you have created!
Thank you for following your dreams and making these TiNspire applications.
Say you have 10 thirteens, 10 twos and 500 threes and need to find
Mean, Mode, Median, Standard Deviation, Variance etc. To avoid looooots of typing you can
now enter such LARGE data using the TiNspire’s Statistics Made Easy app at
Enter data as simple as : [10,10,500] and [13,2,3]
Voila! That simple!
We love your suggestions, keep them coming. This feature was suggested by user Steve L. GREAT suggestion!
When finding Confidence Intervals for Proportions we typically involve the Normal Distribution to create an confidence Interval estimate.
However, this method requires the conditions np<5 and n(1-p)<5 to be fulfilled.
It is not uncommon to have a large sample size n available which likely disables this method.
This is where the Bliss Method comes in to find the exact Confidence Interval on the TiNspire.
It involves the F-Distribution instead.
Using Statistics Made Easy at
www.TiNspireApps.com use menu option 6 then 8 to perform the Bliss method step by step.
Your apps have really saved the day, when i was in my chemistry class it really helped me understand it at a deeper level.
I got a B in that Class i never thought in my life i would get a B in Chemistry.
These apps really helped me learn Balancing chemical equations, Helped me learn the periodic table, and helped me learn stoichiometry.
I have switched to computer science and will only need 1 more chemistry class but i was glad i had it.
It really saved the day when it came to test time.
At 49.95 it is a steal.
When i got the Business and Statistics made easy it really helps me to visualize it
This will show how easily Hypothesis Test at a given Significance Level can be performed – Step by Step –
using the TiNspire’s Statistics Made Easy at www.TiNspireApps.com
Here is problem that calls for a 2 sided Ztest with given Std Deviation:
Using the Z-test, select the 2 sided test (not equal symbol) at the 5 % level and
entering the 4 values pertaining to the test as shown below:
We immediately see the computed p-value and the drawn conclusion (here we fail to reject Ho as the p value larger than 5%)
Besides Significance Tests the Statistics Made Easy is really useful when
performing Confidence Intervals and also Non Parametric Test available at
Normaldistributions can easily be dealt with using the TiNspire and the Statistics Made Easy
If you are to compute the area under the Standard Normalcurve as shown in the problems in the image below:
Just navigate to Normaldistribution in the Menu :
Now enter mean = 1 and std deviation = 0 as we are dealing with the StandardNormal Distribution.
Next enter B as shown given in problem .88 and A can be any number below -3 … out comes the answer
Alternatively, you could have entered .88 for A and found the answer in the 3. line instead of the 2. line
Additionally, InvNorm type problems (given area find z value ) can also be solved
using this Statistics Made Easy app at