Chapter 4: Statistical Calculations

The following statistics can be obtained for each statistical calculation (refer to the table below):

 

Variables

Contents

Key operations

 

n

Number of samples

I00

 

 

 

 

 

¯x

Mean of samples (x data)

I01

 

 

 

 

Q

sx

Sample standard deviation (x data)

I02

 

 

 

σ x

Population standard deviation ( x data)

I03

 

 

 

 

 

 

Σx

Sum of samples (x data)

I04

 

 

 

 

 

Σx2

Sum of squares of samples (x data)

I05

 

¯y

Mean of samples (y data)

I06

 

 

 

 

 

sy

Sample standard deviation (y data)

I07

 

 

 

 

 

σ y

Population standard deviation ( y data)

I08

 

 

 

 

 

Σy

Sum of samples ( y data)

I09

 

 

 

 

W

Σy 2

Sum of squares of samples ( y data)

I0A

Σ x y

Sum of products of samples (x, y )

I0B

 

 

 

 

 

 

a

Coefficient of regression equation

I20

 

 

 

 

 

b

Coefficient of regression equation

I21

 

 

 

 

 

c

Coefficient of quadratic regression equation

I22

 

 

 

 

 

r

Correlation coefficient

I23

• Use I key to perform a STAT variable calculation.

Single-variable statistical calculation

Statistics of 1 and value of the normal probability function

Linear regression calculation

Statistics of 1 and 2 for a given x (estimate

(except coefficients c) and, in addition, estimate of y y´) and estimate of x for a given y (estimate x´)

Exponential regression, logarithmic regression, power regression, and inverse regression calculation

Statistics of 1 and 2 (except coefficients c). In addition, estimate of y for a given x (estimate y´) and estimate of x for a given y (estimate x´). (Since the calculator converts each formula into a linear regression formula before actual calculation takes place, it obtains all statistics, except coefficients a and b, from converted data rather than entered data.)

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Sharp EL-5250, EL-5230 operation manual Single-variable statistical calculation, Linear regression calculation

EL-5230, EL-5250 specifications

The Sharp EL-5250 and EL-5230 are advanced scientific calculators that cater to students, professionals, and anyone in need of a reliable tool for complex calculations. Both models are designed with a blend of functionality, portability, and user-friendliness, making them excellent choices for math and engineering tasks.

The Sharp EL-5250 is equipped with a wide range of features ideal for higher-level calculations. It supports over 500 functions, including trigonometric, exponential, logarithmic, and statistical computations. The calculator also includes built-in memory functions, allowing users to store and recall values effortlessly. The large, easy-to-read LCD display can present multiple lines of data simultaneously, enhancing clarity and reducing the need for repetitive calculations.

On the other hand, the EL-5230, while slightly less advanced, still offers a robust set of functions. This model is particularly well-suited for students in high school or early college, providing essential functionalities for algebra, geometry, and basic statistics. Its 240 functions cover a variety of mathematical disciplines, making it a versatile option for different educational needs.

Both calculators feature Sharp's unique "MathPrint" technology, which is a standout characteristic allowing users to view fractions, square roots, and other expressions in a format more akin to traditional textbook layouts. This technology greatly enhances comprehension and usability, particularly for visual learners.

The calculators are powered by dual power sources, utilizing both solar and battery power, ensuring reliability in diverse environments. The compact and lightweight design of the EL-5250 and EL-5230 makes them highly portable. Users can easily carry them in a backpack or briefcase without added bulk.

Durability is another aspect where Sharp excels. The calculators are built to withstand regular use, featuring a sturdy exterior. Additionally, Sharp provides a protective cover that helps prevent damage during transport, making these calculators a long-term investment for users.

In summary, both the Sharp EL-5250 and EL-5230 deliver exceptional performance with their extensive features and advanced technology. They are perfect for those who require reliable and efficient tools for various mathematical tasks, whether in education or professional settings. With their user-friendly designs and durability, these calculators continue to be reliable companions for anyone working with numbers.