If you have a TI-Nspire cx, you have the ability to use color in your graphical displays. Let’s end by changing the color of the histogram bars. Click on one of the bars to highlight it. Then, press /b and select 7:Color followed by 2:Fill Color. Select whichever color you prefer.
On the TI-Nspire, you scan perform some basic statistical functions on a single data set. Assume that you’ve entered the first-semester averages for two Algebra II classes in a column titled algebra2, and you’re interested in performing a one-variable statistical analysis on this data.
Press [ENTER] to indicate that you want to analyze one list.
If you have additional lists, change the Num of Listsfield to match the number of lists that you are interested in analyzing.
Configure the dialog box as shown.
Scroll down column C to review the statistical results that are generated by this action. The following list contains a description of what each result means:
Sample mean,
Sum of the data,
Sum of the squared data,
Sample standard deviation, sx
Population standard deviation,
Sample size, n
Minimum value, MinX
First quartile, Q1X
Median, MedianX
Third quartile, Q3X
Maximum value, MaxX
Sum of squared deviations, SSX
You also could have created a separate list for each Algebra II class, one in column A and one in column B. To do this, press [MENU]→Statistics→Stat Calculations→Two-Variable Statistics to obtain the single-variable statistics for both classes simultaneously.
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By Andrea Griffith
Calculating probability requires finding the different number of outcomes for an event---if you flip a coin 100 times, you have a 50 percent probability of flipping tails. Normal distribution is the probability of distribution among different variables and is often referred to as Gaussian distribution. Normal distribution is represented by a bell-shaped curve, where the peak of the curve is symmetrical around the mean of the equation. Calculating probability and normal distribution requires knowing a few specific equations.
Probability
Write down the equation for probability: p = n / N. The 'n' stands for favorable elements, and the 'N' stands for set elements. For this example, let's say that you have 20 apples in a bag. Out of the 20 apples, five of are green apples and the remaining 15 are red apples. If you reach into the bag, what's the probability that you will pick up a green one?
Divide 5 into 20:
Keep in mind that the outcome can never be equal to or greater than 1.
Multiply 0.25 by 100 to get your percentage:
The odds of you grabbing a green apple out of a bag of 15 red apples are 25 percent.
Normal Distribution
Write down the equation for normal distribution: Z = (X - m) / Standard Deviation.
Z = Z table (see Resources) X = Normal Random Variable m = Mean, or average
Let's say you want to find the normal distribution of the equation when X is 111, the mean is 105 and the standard deviation is 6.
Z = (111 - 105) / 6
Z = 6 / 6
Z = 1
Look up the value of 1 from the Z table (see Resources):
Z = 1 = 0.3413 Because the value of X (111) is larger than the mean (105) in the beginning of the equation, you're going to add 0.5 to Z (0.3413). If the value of X was less than the mean, you'd subtract 0.5 from Z.