Sharp EL-9900 operation manual 174

Chapter 10: Statistics & Regression Calculations

3.Press @h. Answers will be displayed on

^

the screen, where P indi- cates the calculated success rate of the data combined

with sample data 1 and 2,

^ ^

and P1 and P2 show the success rates of sample data 1 and 2, respectively. n1 and n2 are positive integers.

12 Zint1samp Finds the confidence interval of a population mean, ∝.

Example

The average weight of a newly developed product is known to be

52.4g and standard deviation (σ) is 4.5. Given the average weight of 20 units is 53.4 g (x), find the confidence interval of the data where the level of confidence (C-level) is 0.95.

Set the input method to value input mode

1. Press #SE17E.

2.Press SE12.

The parameter input screen will appear.

3.Enter the appropriate value into each field.

4.Press @h. Answers will be displayed on the screen, where the numerical value within () indicates the confidence interval with the level of

confidence at 0.95, that is, the confidence interval of this sample data with the confidence level of 95% is between 51.427… and 55.372….

C-level indicates the level of confidence and n is a positive integer.

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