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1. One-variable statistical calculation
1. One-variable statistical calculation
Calculate the sum (Σx), sum of square (Σx2), number (n), mean (x̅), and generating standard deviation (σ) of the above variable (x).
Entering variables
Obtaining statistics
After obtaining the statistics, you can proceed with the statistics calculation if you enter variables.
Correcting statistical data
When you find an error before pressing the [DATA] key, press the [ON CE/C] key to correct it.
Example:
4 (Error) [ON CE/C] 3 (Correct data entry)
When you cancel the statistical data after pressing the [DATA] key, re-type the incorrect data, then press [INV]CD. After that, re-enter the correct data.
Example:
4 [DATA] (Incorrect)
4 [INV]CD (Cancel the data)
21 [DATA] (Enter the correct data)
Example:
Even after entering some data, you can correct the incorrect data “12” in the following operation.
11 [DATA]
12 [DATA] (Incorrect)
31 [DATA]
41 [DATA]
Then, error found,
12 [INV]CD (Cancel the data)
21 [DATA] (Enter the correct data)
Entering frequency variables
Example:
Calculate the statistics of the following frequency variables.
2. Two-variable statistical calculation/Regression Analysis
2. Two-variable statistical calculation/Regression Analysis
Example:
The following list is of the data about heights and weights of students at a high school.
The following operation is for calculating the regression line that forecasts weight from height, when the heights are independent variables and weights are dependents.
And it is also for calculating the correlation of weight and height.
Displaying of statistics
Moreover you can proceed to calculate by adding the sixth data.
Correcting statistical data
Correcting the data entered by two-variable statistics (STAT2) mode.
When entering an incorrect number 4 instead of the correct number 5:
If you find the error before pressing the [a], [b] key or the [DATA] key, press the [ON CE/C] key to correct it.
Example:
4 (Error) [ON CE/C] 5 [a] (Correct)
If you find the error after pressing the [a], [b] key, enter the correct data, then press the [a], [b] key again.
Example:
3 [a] 4 [b] (Error) 5 [b] (Correct) [DATA]
If you find the error after pressing the [DATA] key, re-type the incorrect data, then press [INV]CD. The incorrect data is cleared. Re-enter the correct data.
Example:
Correct (4, 5) into (7, 2)
3. Normal probability function calculation
3. Normal probability function calculation
Normal probability function P(t), Q(t) or R(t) is calculated by the statistics mode.
In case the total is “1” in the standard normal distribution, the range of each function is shown as below.
Normal Distribution Curve
The probability of being between −∞ and a (σ)
The probability of being between 0 and a (σ)
The probability of being between a (σ) and +∞
Enter the value which is changed from the general normal distribution into the standard normal distribution, as the entry data a.
The value is obtained by the above formula.
The [INV]t key is to change a variable from the general normal distribution into the standard normal distribution.
The variable is obtained by the following formula (the unit of σ is standard).
t = (x − x̅) / σ
x : Entry number (Random number in the normal distribution)
x̅ : Mean
σ : Sample standard deviation
If you are given mean and standard deviation, you can calculate the normal probability function without regard to the statistical data.
Example:
Calculate the probability of variables that show frequency more than 170.
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